Managing grains and interfaces via ligand anchoring enables 22.3%-efficiency inverted perovskite solar cells

Xiaopeng Zheng, Yi Hou, Chunxiong Bao, Jun Yin, Fanglong Yuan, Ziru Huang, Kepeng Song, Jiakai Liu, Joel Troughton, Nicola Gasparini, Chun Zhou, Yuanbao Lin, Ding-Jiang Xue, Bin Chen, Andrew K. Johnston, Nini Wei, Mohamed N. Hedhili, Mingyang Wei, Abdullah Yousef Alsalloum, Partha MaityBekir Turedi, Chen Yang, Derya Baran, Thomas D. Anthopoulos, Yu Han, Zheng-Hong Lu, Omar F. Mohammed, Feng Gao, E. Sargent, Osman Bakr

Research output: Contribution to journalArticlepeer-review

143 Scopus citations

Abstract

Inverted perovskite solar cells have attracted increasing attention because they have achieved long operating lifetimes. However, they have exhibited significantly inferior power conversion efficiencies compared to regular perovskite solar cells. Here we reduce this efficiency gap using a trace amount of surface-anchoring alkylamine ligands (AALs) with different chain lengths as grain and interface modifiers. We show that long-chain AALs added to the precursor solution suppress nonradiative carrier recombination and improve the optoelectronic properties of mixed-cation mixed-halide perovskite films. The resulting AALs surface-modified films exhibit a prominent (100) orientation and lower trap-state density as well as enhanced carrier mobilities and diffusion lengths. These translate into a certified stabilized power conversion efficiency of 22.3% (23.0% power conversion efficiency for lab-measured champion devices). The devices operate for over 1,000h at the maximum power point under simulated AM1.5 illumination, without loss of efficiency.
Original languageEnglish (US)
JournalNature Energy
DOIs
StatePublished - Jan 20 2020

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