Affiliation:
1. School of Materials and Energy University of Electronic Science and Technology of China Chengdu 611731 P. R. China
2. State Key Laboratory of PV Science and Technology Trina Solar ChangZhou 213031 P. R. China
3. Sichuan Research Center of New Materials National Energy Novel Materials Center Institute of Chemical Materials China Academy of Engineering Physics Chengdu 610200 P. R. China
Abstract
AbstractWide‐bandgap metal halide perovskites have demonstrated promise in multijunction photovoltaic (PV) cells. However, photoinduced phase segregation and the resultant low open‐circuit voltage (Voc) have greatly limited the PV performance of perovskite‐based multijunction devices. Here, a alloying strategy is reported to achieve uniform distribution of triple cations and halides in wide‐bandgap perovskites by doping Rb+ and Cl− with small ionic radii, which effectively suppresses halide phase segregation while promoting the homogenization of surface potential. Based on this strategy, a Voc of 1.33 V is obtained from single‐junction perovskite solar cells, and a VOC approaching 3.0 V and a power conversion efficiency of 25.0% (obtained from reverse scan direction, certified efficiency: 24.19%) on an 1.04 cm2 photoactive area can be achieved in a perovskite/perovskite/c‐Si triple‐junction tandem cell, where the certification efficiency is by far the greatest performance of perovskite‐based triple‐junction tandem solar cells. This work overcomes the performance deadlock of perovskite‐based triple‐junction tandem cells by setting a materials‐by‐design paradigm.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Natural Science Foundation of Sichuan Province
Fundamental Research Funds for the Central Universities
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science