In Neuchâtel (Switzerland), CHEOPS researchers from EPFL and CSEM have combined silicon- and perovskite-based solar cells. The resulting efficiency of 25.2% is a record for this type of tandem cell. Their innovative yet simple manufacturing technique could be directly integrated into existing production lines, and efficiency could eventually rise above 30%.
As it has been a tradition for nearly a quarter of a century, once every 4 years, three of world’s most prominent international photovoltaic technical conferences, the Photovoltaic Science and Engineering Conference (PVSEC), the European Photovoltaic Solar Energy Conference (EU PVSEC) and the IEEE Photovoltaic Specialist Conference (IEEE PVSC) merge into a global photovoltaic energy technical forum: The World Conference on Photovoltaic Energy Conversion. In 2018 the WCPEC-7, that combines the 45th IEEE PVSC, the 28th PVSEC and the 34th EU PVSEC, returns to the birth place of the World Conferences and will be held June 10-15, 2018 on the Big Island of Hawaii. CHEOPS will contribute with ...
The field of perovskite photovoltaics research is currently undergoing rapid development and is considered to be one of the most promising renewable energy technologies to date. CHEOPS - an EU funded project aiming at achieving low cost and highly efficient perovskite solar cells - has therefore taken the initiative to gather all major EU-funded perovskite PV projects to exchange project results at the highest level at the University of Oxford this summer.
On 25th and 26thJune 2018 the all major EU-funded projects working on perovskite PV technology will gather at ...
In the first months of 2018 the EU funded project CHEOPS - dedicated to achieving low-cost and highly efficient perovskite solar cells - has presented a number of encouraging results to improve this renewable energy technology. Here are the highlights from the most recent journal publications and conference presentations:
Present status and future prospects of perovskite photovoltaics
H. J. Snaith, Nature Materials Vol. 17 May 2018 p. 372-276
In his comment in Nature Materials from April 2018, Henry J. Snaith from the University of Oxford highlights the “rigorous life-cycle assessment” of perovskite-on-silicon tandem cells and module productions conducted by the two CHEOPS partners Oxford PV and SmartGreenScans. View the entire article without subscription here.
Given their low cost and high power conversion efficiency, perovskite solar cells have gained attention in recent years. However, the use of this perovskite solar cell technology has also raised concerns about their environmental impact, notably due to the presence of lead.
SmartGreenScans, a CHEOPS partner specialising in Life-Cycle Assessment (LCA) of photovoltaic technologies, has conducted a preliminary study to assess the life-cycle environmental impact of the perovskite/silicon tandem modules to be commercialised by Oxford PV, another CHEOPS partner. The analysis covers all activities from “cradle” up to the factory “gate” where it is manufactured and assembled. This “cradle-to-gate analysis” is considered a partial product life-cycle.
50% thickness = 10% performance increase
Results show that, in this case, less is more:
Reducing the thickness of BL-TiO2 from 40-50 nm to 20-30 nm increased the open circuit voltage by 10.36 % on average. The fill factor was increased by an average of 3.79 % (absolute increase). The picture below shows a cross-sectional scanning electron microscope (SEM) image of the optimized device stack.
To achieve a series-interconnection between cells, three laser lines of different depth are needed (see figure below): The first laser (P1) breaks up the front contact of the cell. The second laser (P2) burns a trench into the perovskite layer. This trench is later filled with back electrode material, serving as the back contact, and forms the series connection between front and back contact of the cell. Finally, the third laser (P3) burns a trench into both back electrode material and perovskite layer and thus makes sure that current flows only between back and front contact.
Perovskite solar technology leader and CHEOPS partner Oxford PV has been named in the Top 50 world most innovative companies of 2017, by the German edition of MIT Technology Review. At the MIT Technology Review’s award ceremony, Oxford PV is also featured in the top three companies in the category “Newcomer of the Year”.
Oxford PV has been recognised for its innovative perovskite solar cell technology that has the potential to dramatically improve the efficiency of silicon solar cells and support the proliferation of solar energy generation globally.
“Oxford PV has made significant progress over the past few years. We have already developed in the lab an advanced perovskite on silicon tandem solar cell and we are in the process of rapidly transferring this to an industrial scale process.” said Frank Averdung, Chief Executive Officer, at Oxford PV.