Holiday Wish

December 23 2022

The year 2022 was exceptional for photovoltaics in Slovenia, as the current estimate of newly connected solar PV power plants exceeds 250 MW. This is a 50% increase in the cumulative installed PV power, which mostly comes from private investments in small solar PV power plants in net-metering scheme.

The year 2022 was also exceptional for the Laboratory for Photovoltaics and Optoelectronics. We will remember it for the excellent achievements of its members:

  • Prof. Em. Dr. Franc Smole – elected as a Professor Emeritus of University of Ljubljana
  • Prof. Dr. Marko Topič – Becquerel Award for outstanding merits in Photovoltaics
  • Assoc. Prof. Dr. Marko Jankovec – Vidmar's Award
  • Asst. Prof. Dr. Marko Jošt et al. – Recognition for one of the top 10 research achievements of the University of Ljubljana in 2022

At the end of the year, we wish you to take the advantage of relaxing holidays for an effective rest, which will ensure the renewal of positive energy and prepare you for a healthy, successful and happy coming year 2023!

Happy New Year!


Start of the Pepperoni Project

November 25 2022

LPVO has started participation in the international Horizon Europe Pepperoni project. The Pepperoni consortium has 17 partners from 12 European countries. The project is led by German partners: the Helmholtz-Zentrum Berlin Institute and the manufacturer of solar cells and photovoltaic modules Q Cells.

The Pepperoni project (Pilot line for European Production of PEROvskite-Silicon taNdem modules on Industrial scale) is a four-year research and innovation project co-financed by the European Union within the Horizon Europe program and the Swiss State Secretariat for Education, Research and Innovation. The project focuses on the development of tandem perovskite-silicon solar cells. The aim of the project is to accelerate the development of tandem cells, their introduction to the market and the establishment of a pilot line as a basis for the introduction of new production capacities in Europe.

First press release.


LPVO at World photovoltaic conference WCPEC-8

September 16 2022

We will actively participate in the World Photovoltaic Conference WCPEC-8 in Milan between September 26 and 30. This year's world conference combines the European (39th EU PVSEC), American (IEEE PVSC-51) and Asian (PVSEC-32) photovoltaic conferences and will be held both live and online. We will participate in the conference in three roles, with scientific contributions and at the fair, while Prof. Dr. Marko Topič also as a recipient of the prestigious Becquerel Award.

Scientific contributions with first authorship:

  • 2AV.1.3, M. Remec, Quantifying Energy Losses Due to Light Soaking Effect in Perovskite Solar Cells under Outdoor Conditions
  • 2AV.1.47, D. Uršič, Energy Harvesting from a Single Lab-Scale Perovskite Solar Cells for Self-Powered Indoor IoT Applications
  • 2AV.3.11, M. Kovačič, Optical Effects of Laser-Reduced Graphene Oxide Layers in Tandem Perovskite/CIGS Solar Cells studied by Numerical Simulations
  • 2AV.3.12, Š. Tomšič, Modelling and Optimization of Perovskite-Silicon Tandem Devices for Enhanced Field Energy Production
  • 1BO.4.6, M. Bokalič, Insights into Cut-edges of SHJ Solar Cells by EL and LBIC Characterization
  • 2BO.9.1, K. Brecl, The impact of high negative bias on perovskite solar cells in PID testing
  • 3DV.1.43, U. Barbič, Stand-alone IoT Enabled Bifacial Irradiance Sensor for PV
  • 1DV.4.7, M. Kikelj, Cut out for Efficiency: A Detailed LBIC Study of Edge Recombination in Cut-Cell Silicon Photovoltaics

Scientific contributions in collaboration:

  • 2AV.3.15, L. Senaud, High Efficiency 3-Terminal Perovskite/Silicon Tandems Based on Tunnel Junction IBC
  • 2BO.9.6, M. Khenkin, Indoor and Outdoor Ageing of Perovskite Solar Cells: Long-Term Stability vs Meta-Stability
  • 3CO.6.3, L. Tous, Overview of Key Results Achieved in H2020 HighLite Project Helping to Raise the EU PV Industries’ Competitiveness
  • 4DO.3.5, A. Faes, Photovoltaics Modules and Systems Monitoring within HighLite H2020
  • 5DV.2.69, S. Nowak, PV Will Shine in the New Clean Energy Transition Partnership

At the exhibition, we will present our solutions in the field of measuring solar cells and monitoring photovoltaic modules at stand E5. We will also be present at stand C8, where together with our European partners we will present the results of the HighLite and SuperPV projects.

The Becquerel Prize Award ceremony will take place as part of the first plenary section of the conference, on Monday, September 26, at 9:30 am.



LPVO at MOS 2022 fair

September 13 2022

International craft fair (MOS) will take place between September 14 and 18 in Celje. LPVO participates in the Intersection of Science and Economy (Stičišče znanosti in gospodarstva), which promotes achievements of Slovenian science and strives for closer cooperation between scientific and economic spheres.

We are present at the booth 16, which is located on the first floor of hall L1.



Becquerel Prize

August 22 2022

Prof. Dr. Marko Topič is this year awardee of the Becquerel Prize. The Becquerel Prize, named after the inventor of the photovoltaic effect, Alexandre-Edmond Becquerel, is granted by the European Comission to a single individual who is recognized for outstanding merits in the field of photovoltaics.

The official award ceremony take place on the occasion of the 8th World Conference on Photovoltaic Energy Conversion, which will take place between September 26 and 30 2022 in Milan.

LinkedIn post.



Free PhD position in LPVO

August 1 2022

In the Laboratory for Photovoltaics and Optoelectronics, we have a vacancy for a young researcher in the field of integrated photonics.

In this field, in the laboratory, we deal with the design, manufacture and characterization of photonic structures and photonic integrated circuits based on silicon technologies. We are involved in the Quantera project in the field of quantum photonics for the production of efficient quantum-photonic circuits produced with the help of microtransfer printing on a silicon-nitride platform. There are many new challenges for the doctoral dissertation in this field.

The PhD student will be involved in the current research in the field of integrated photonics at the Faculty of Electrical Engineering in cooperation with leading European institutions in the aforementioned field.

Welcome to the world of integrated photonics!

Contact person: Janez Krč


Kick-off of the qTP4Q Project

June 24 2022

The Quantera uTP4Q project partners met at the kick-off meeting of the project at the University of Ghent in Belgium (June 22 2022). The Laboratory for Photovoltaics and Optoelectronics (LPVO) acts as one of six partners on behalf of the University of Ljubljana.

The project entitled A versatile quantum photonic IC platform enabled by micro-transfer printing - uTP4Q extends to the field of integrated quantum photonics. Using the micro-transfer printing method, we intend to combine different components of quantum photonics (single-photon sources, modulators, photodetectors, optical couplers and other components), which are fabricated on different photonic platforms, into a single quantum-photon integrated circuit. You can read more about the project on the web link.



Tapas project meeting

June 17 2022

After the successful completion of the EuroReg PV workshop, we hosted a meeting of the Tapas project at the Laboratory for Photovoltaics and Optoelectronics within the Faculty of Electrical Engineering. The Tapas project is a project funded by the Helmholtz European Partnership programme, which focuses on strengthening the existing cooperation between Helmholtz Zentrum Beriln and University of Ljubljana. The topic of the Tapas project is the field of tandem perovskite-silicon solar cells with an emphasis on stability research, finding the source of degradation with advanced characterization techniques, development of dedicated characterization equipment and optoelectric modelling.


Free PhD positions in LPVO

June 15 2022

In the Laboratory for Photovoltaics and Optoelectronics, we have two vacancies for young researchers to work on interesting, current topics. One topic is in the field of photovoltaics and the other in the field of photonics. Contact us for more detailed information. Young researchers are enrolling in doctoral studies at the Faculty of Electrical Engineering in the coming academic year.

The deadline for applying for vacancies is short, so please contact Prof. Dr. Janez Krč or Prof. Dr. Benjamin Lipovšek as soon as possible (no later than June 30, 2022).


The 8th Slovenian Photovoltaic Conference SLO-PV 2022 and Workshop EuroReg-PV 2022

June 8 2022

The Laboratory for Photovoltaics and Optoelectronics and the Slovenian Technological Platform for Photovoltaics are organizing the 8th Slovenian Photovoltaic Conference SLO-PV 2022, which will take place on Tuesday, 14 June 2022, between 9 am and 2 pm at the Faculty of Electrical Engineering, Tržaška cesta 25 in Ljubljana.

At this year's photovoltaic conference, experts will present the latest trends in research and development of solar cells, photovoltaic modules, inverters or photovoltaic systems. They will provide relevant information on the management and maintenance of photovoltaic systems, talk about the development of the Slovenian photovoltaic market and provide answers to questions regarding the installation of a solar power plant and connection to the electricity grid. There will also be a fair presentation of companies offering products and services in the field of photovoltaics and sustainable energy. Attendance at the conference is free, only registration is required.

The EuroReg-PV 2022 workshop will be held shortly after the SLO-PV 2022 conference from 16 to 17 June 2022 at the Faculty of Electrical Engineering in our organization.


Article in Journal ACS Energy Letters

March 10 2022

An article entitled Perovskite/CIGS Tandem Solar Cells: From Certified 24.2% toward 30% and Beyond was published yesterday in one of the top five international scientific journals in the field of energy and nanosciences, ACS Energy Letters. The article presents a record Perovskite/CIGS tandem solar cell with 24.2% conversion efficiency, which was the result of collaboration between the Laboratory for Photovoltaics and Optoelectronics (LPVO) and Helmholtz Zentrum Beriln (HZB). Dr. Marko Jošt is the first author, the other co-authors from LPVO are young researcher Špela Tomšič, Assoc. Prof. Dr. Benjamin Lipovšek and Prof. Dr. Marko Topič.


The first press release from the Aurora project

January 18 2022

As part of the Aurora project, we issued the first press release. You can downloaded it in several languages from the project website.


Holiday Wish

December 23 2021

The year 2021 was unprecedented in many ways. Unfortunately, it was still impacted by the epidemic that changed our way of working and international cooperation. Despite the limitations, in LPVO, we will remember it for positive achievements and new experiences.

Take the advantage of the upcoming holidays to renew stocks of positive energy and efficient rest in the circle of loved ones.

In the coming year 2022, we wish you good health, effective overcoming of new challenges and sustainable personal and business development.

Happy New Year!


Kick-off of the Aurora project

December 1 2021

On December 1, we launched the AURORA (Achieving a new European Energy Awareness) project, funded by the recognized EU Horizon 2020 programme. The Aurora project is an innovation action that will bring photovoltaics closer to the citizens. We will install solar power plants with a total capacity of 1 megawatt at five locations in the EU, in Denmark, Portugal, Slovenia, Spain and the United Kingdom. Solar power plants will be crowd-funded by citizens, thus reducing their carbon footprint. With the developed app, the participants will follow their carbon footprint and, with the help of the project, reduce it as much as possible in order to become "near zero-emission citizens".

The first project meeting will be held on December 14 by the coordinator, the Polytechnic University of Madrid.


Defense of the PhD Thesis

October 20 2021

PhD student in scope of the Solar-Train project, Stefan Mitterhofer defended his PhD thesis entitled Modelling and monitoring of moisture transport phenomena in polymeric materials and photovoltaic modules on 20th of October. The defense was held online at 3:00 PM. Committee members were Prof. Dr. Gregor Dolinar (chair), Prof. Dr. Marko Topič, Prof. Dr. Janko Drnovšek, Dr. Tom Betts (University of Loughborough) and Assoc. Prof. Dr. Marko Jankovec (advisor).


Paper chosen to Spotlight on Optics

October 5 2021

A paper by Dr. Milan Kovačič entitled Analysis and optimization of light outcoupling in OLEDs with external hierarchical textures published in journal Optics Express was chosen for inclusion in Spotlight on Optics. Articles featured in the Spotlight are chosen by the editors based on excellent scientific quality and appeal to the broader optics and photonics community.



Defense of the PhD Thesis

September 21 2021

PhD student in scope of the Solar-Train project, Julián Andrés Ascencio Vásquez defended his PhD thesis entitled Modelling and worldwide assessment of performance and aging of photovoltaic modules and systems on 21st of September. The defense was held online at 2:00 PM. Committee members were Prof. Dr. Roman Kamnik (chair), Prof. Dr. Janez Krč, Assoc. Prof. Dr. Marko Jankovec, Prof. Dr. Ralph Gottschalg (Fraunhofer CSP) and Prof. Dr. Marko Topič (advisor).


Double award at EU PVSEC

September 10 2021

Miha Kikelj  has won two awards for the contribution to the European Photovoltaic Conference EU-PVSEC 2021 entitled“Do Not Blame the Butter for What the Bread Did” or How the Optical Properties of IBC Solar Cells Affect the Results of Spatially Resolved Characterization:

  • EU PVSEC 2021 Student Award
  • EU PVSEC 2021 Poster Award

In addition to the important discovery of the influence of optics on the results of spatially resolved electrical simulations, an excellent video presentation undoubtedly contributed to the award. We invite you to take a look at it.




August 26 2021

We will attend the the largest photovoltaic conference the EU-PVSEC 2021. The conference will again be held online due to Covid-19 pandemic. Between September 6 and 10, we will present results of our latest research and collaboration in seven contributions:

  • 4BO.1.1, L. Tous, Overview of the Latest Results Achieved in the H2020 Funded Project HighLite Aiming for High-Performance
  • 3BV.2.57, M. Jošt, Bichromatic Light Source for Subcell Performance Analysis in Perovskite/Silicon Tandem Solar Cells
  • 2CV.1.4, M. Kikelj, “Do Not Blame the Butter for What the Bread Did” or How the Optical Properties of IBC Solar Cells Affect the Results of Spatially Resolved Characterization Methods
  • 6CP.1.5, M. Topič, European Strategic Research & Innovation Agenda (SRIA) for Photovoltaics – Fit for 55% and Climate Neutrality
  • 3CO.6.2, M. Bokalič, Electroluminescence Intensity Stabilization in Perovskite Solar Cells
  • 5DO.1.5, J. Ascencio-Vásquez, Application of Machine Learning to Assess the Thermal Behaviour of PV Modules in Different Climate Zones
  • 5DO.4.6, J. Ascencio-Vásquez, Modelling and Impact of Solar Eclipses on PV Energy Production

See you online!


Prof. dr. Marko Topič was Elected SAZU Associate Member

June 3 2021

Prof. Dr. Marko Topič was elected a member of The Slovenian Academy of Sciences and Art. The election took place on June 3 2021 and he was elected an associate member in Section III of Mathematical, Physical, Chemical and Technical Sciences.



Defense of the PhD Thesis

March 18 2021

PhD student in scope of the Solar-Train project, Sascha Lindig defended his PhD thesis entitled Impact of outdoor effects, degradation and technical failures on uncertainty in energy performance of photovoltaic systems on 18th of March. The defense was held online at 2:00 PM. Committee members were Prof. Dr. Roman Kamnik (chair), Prof. Dr. Janez Krč, Assoc. Prof. Dr. Marko Jankovec, Prof. Dr. Wilfried van Sark (Utrecht University), Prof. Dr. Marko Topič (advisor) and Dr. David Moser (co-advisor, Eurac Research).

Center of Distributed Energy SourcesPhotovoltaic technology platformSlovenian Photovoltaic Industry AssociationEuropean Energy Research Alliance