Efficient external radiation is essential for solar cells to achieve high power conversion efficiency (PCE). The classical limit of 1/2n2 (n, refractive index) for electroluminescence quantum efficiency (ELQE) has recently been approached by perovskite solar cells (PSCs). Photon recycling (PR) and light scattering can provide an opportunity to surpass this limit. We investigate the role of PR and scattering in practical device operation using a radiative PSC with an ELQE (13.7% at 1 sun) that significantly surpasses the classical limit (7.4%). We experimentally analyze the contributions of PR and scattering to this strong radiation. A novel optical model reveals an increase of 39 mV in the voltage of our PSC. This analysis can provide design principles for future PSCs to approach the Shockley-Queisser efficiency limit.
Bibliographical noteFunding Information:
This study was funded by the Alexander von Humboldt Foundation via Humboldt Research Fellowship for Postdoc Researchers (C.C.), Global Frontier R&D Program of the Center for Multiscale Energy Systems funded by the Korean government (MSIP) (NRF- 2012M3A6A7054855) (Y.-W.J. and M.C.), National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP) (NRF-2020R1A2C3009115) (S.L. and J.H.N.), Deutsche Forschungsgemeinschaft (DFG) for funding in the framework of SPP 2196 (project PERFECT PVs, VA 991/3-1 and DE 830/22-1) (Y.V.), and DFG for funding in project Le747/64-1 (K.L.).
Acknowledgments Funding: This study was funded by the Alexander von Humboldt Foundation via Humboldt
Copyright © 2021 The Authors, some rights reserved.
ASJC Scopus subject areas