Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP23)
DOI: https://doi.org/10.29363/nanoge.iperop.2023.033
Publication date: 21st November 2022
Tandem solar cells that combine perovskite (PVK) top cells and Si, Cu(In,Ga)(Se,S)2 (CIGS), PVK and other bottom cells have attracted much attention for increasing the efficiency of solar cells [1,2]. To use the PVK solar cells (PSC) as the top cells, their metal electrode needs to be replaced with a transparent conductive layer such as indium tin oxide (ITO) deposited by sputtering, however, it is still on discussion about the damage by the sputtering during the deposition to the layers. In this study, double layer ITO of 50 nm for the damage controlling of spatter as first and 250 nm for high conductivity as second were introduced. It was revealed that the effect of ion bombardment during first ITO sputtering on spiro-OMeTAD was not detrimental in the suitable condition of oxygen concentration and sputter power density during the deposition process. The photovoltaics of semi-transparent PVK cells has been developed with less damage and higher conductivity with enough transmittance, then the power conversion efficiency (PCE) of 19.5% (certified 19.3%) was achieved for a 1 cm2 buffer-free semi-transparent PVK cell. Furthermore, mechanically stacked four-terminal PSC / CIGS tandem solar cells showed 26.2% of PCE [3].
References:
[1] Yeom, K. M.; et al., Adv. Mater. 2020, 32, e2002228, 32909335.
[2] Zhu, Z., et al., J. Energy Chem. 2021, 58, 219–232.
[3] M. Nakamura, et al., ACS Appl. Energy Mater. 2022, 5, 8103−8111
Despite the short notice, Ms. Hiromi Tobita from JET kindly accepted our request for the device evaluation and provided us with constructive feedback. We sincerely appreciate her professional work. This work was partially supported by the New Energy and Industrial Technology Development Organization PV R&D programs (no. 200015) and the Fondation Franco-Japonaise Sasakawa (no. 20-PT/26).
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