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High-Performance Lead-Free Solar Cells Based on Tin-Halide Perovskite Thin Films Functionalized by a Divalent Organic Cation

  • Min Chen
  • , Qingshun Dong
  • , Felix T. Eickemeyer
  • , Yuhang Liu
  • , Zhenghong Dai
  • , Alexander D. Carl
  • , Behzad Bahrami
  • , Ashraful H. Chowdhury
  • , Ronald L. Grimm
  • , Yantao Shi
  • , Qiquan Qiao
  • , Shaik Mohammed Zakeeruddin
  • , Michael Grätzel
  • , Nitin P. Padture
  • Brown University
  • Dalian University of Technology
  • Swiss Federal Institute of Technology Lausanne
  • Worcester Polytechnic Institute
  • South Dakota State University

Research output: Contribution to journalArticlepeer-review

111 Scopus citations

Abstract

Tin-based halide perovskite solar cells (PSCs) hold the most promise among lead-free PSCs, but they are plagued with inadequate environmental stability and power-conversion efficiency (PCE). Here we demonstrate that the optimum incorporation of a bulky divalent organic cation, 4-(aminomethyl)piperidinium (4AMP), in FASnI3 thin films improves stability, optoelectronic properties, and PSC performance. The optimized PSC yields a maximum PCE of 10.9% and good 500-h operational stability under continuous illumination. This is attributed to the unique thin-film structure, where the strong ionic bonding afforded by divalent 4AMP may provide near-full-coverage functionalization (encapsulation) of FASnI3 grain surfaces and grain boundaries, retarding O2/H2O ingression and mitigating Sn-defects for reduced photocarrier nonradiative recombination.

Original languageEnglish
Pages (from-to)2223-2230
Number of pages8
JournalACS Energy Letters
Volume5
Issue number7
DOIs
StatePublished - 10 Jul 2020
Externally publishedYes

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

  1. SDG 7 - Affordable and Clean Energy
    SDG 7 Affordable and Clean Energy

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