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 Nejib Hedhili, Mingyang Wei, Abdullah Y. Alsalloum, Partha MaityBekir Turedi, Chen Yang, Derya Baran, Thomas D. Anthopoulos, Yu Han, Zheng Hong Lu, Omar F. Mohammed, Feng Gao, Edward H. Sargent, Osman M. Bakr

Research output: Journal article publicationJournal articleAcademic researchpeer-review

517 Citations (Scopus)

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 AAL 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 1,000 h at the maximum power point under simulated AM1.5 illumination, without loss of efficiency.

Original languageEnglish
Pages (from-to)131-140
Number of pages10
JournalNature Energy
Volume5
Issue number2
DOIs
Publication statusPublished - 1 Feb 2020

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology

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