Amelioration of Semi-Transparent Perovskite Solar Cell and its application to 4-terminal Tandem Structure with CIGS
Takeru Bessho a
a Research Center for Advanced Science and Technology (RCAST), The University of Tokyo 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
Proceedings of Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP23)
Kobe, Japan, 2023 January 22nd - 24th
Organizers: Seigo Ito, Hideo Ohkita and Atsushi Wakamiya
Invited Speaker Session, Takeru Bessho, presentation 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].


[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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