Suppressing Nonradiative Losses in Wide-Band-Gap Perovskites Affords Efficient and Printable All-Perovskite Tandem Solar Cells with a Metal-Free Charge Recombination Layer

• Published in: ACS energy letters Vol. 8; no. 1; pp. 502 - 512
• Main Authors: Zhou, Xinming, Lai, Hongwei, Huang, Ting, Chen, Chaoran, Xu, Zhenhua, Yang, Yuzhao, Wu, Shaohang, Xiao, Xiudi, Chen, Lang, Brabec, Christoph J., Mai, Yaohua, Guo, Fei
• Format: Journal Article
• Language: English
• Published: American Chemical Society 13.01.2023
• ISSN: 2380-8195; 2380-8195
• DOI: 10.1021/acsenergylett.2c02156

Although the efficiencies of all-perovskite tandem solar cells have surpassed 26%, further advancement of device performance is constrained by the large photovoltage deficit in wide-band-gap perovskite subcells. Meanwhile, state-of-the-art charge recombination layers incorporate an additional thin metal film (Au or Ag), which not only complexes device fabrication but induces parasitic optical losses. Here, we first fabricate efficient wide-band-gap perovskite solar cells (PSCs) with by suppressing nonradiative losses both in bulk material and at interface. The prepared PSCs with a band gap of 1.71 eV yield an impressive open-circuit voltage (V OC) of 1.27 V, giving a small V OC deficit of 0.44 V and an efficiency of 20.8%. We then fabricate monolithic all-printed perovskite tandem devices by constructing a metal-free recombination layer, which yields an efficiency of 23.65% and a high V OC of 2.05 V. This work offers a simple yet effective charge recombination architecture for advancing the performance of all-perovskite tandem devices.