Spectral Splitting Solar Cells Consisting of a Mesoscopic Wide-Bandgap Perovskite Solar Cell and an Inverted Narrow-Bandgap Perovskite Solar Cell

Kei Ito; Kazuteru Nonomura; Ryota Kan; Keishi Tada; Ching Chang Lin; Takumi Kinoshita; Takeru Bessho; Satoshi Uchida; Hiroshi Segawa

doi:10.1021/acsomega.3c09654

Spectral Splitting Solar Cells Consisting of a Mesoscopic Wide-Bandgap Perovskite Solar Cell and an Inverted Narrow-Bandgap Perovskite Solar Cell

ACS Omega. 2023 Dec 29;9(2):3028-3034. doi: 10.1021/acsomega.3c09654. eCollection 2024 Jan 16.

Authors

Affiliations

¹ Department of Chemical System Engineering, Graduate School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan.
² Department of General Systems Studies, Graduate School of Arts and Sciences, The University of Tokyo, Tokyo 153-8902, Japan.
³ Research Center for Advanced Science and Technology (RCAST), The University of Tokyo, Tokyo 153-8904, Japan.

Abstract

In comparison to monolithic perovskite/perovskite double-junction solar cells, a four-terminal spectrum-splitting system is a simple method to obtain a higher power conversion efficiency (PCE) because it has no constraints of unifying the structures of the top and bottom cells. In this work, utilizing the fact that low-bandgap Sn-Pb bottom cells work the best in p-i-n while Pb-based wide-bandgap top cells work better in an n-i-p architecture, a wide-bandgap (E_g = 1.61 eV) perovskite solar cell with a mesoscopic structure and a narrow-bandgap (E_g = 1.27 eV) perovskite solar cell with an inverted structure were combined to fabricate a double-junction four-terminal spectral splitting solar cell. The double-junction solar cell with the 801 nm spectral splitting with an active area of 0.18 cm² was found to work with a PCE of 25.3%, which is the highest reported so far for a 4-T all-perovskite double-junction spectral splitting solar cell.