Multichannel Interdiffusion Driven FASnI3 Film Formation Using Aqueous Hybrid Salt/Polymer Solutions toward Flexible Lead-Free Perovskite Solar Cells

Xi, Jun; Wu, Zhaoxin; Jiao, Bo; Dong, Hua; Ran, Chenxin; Piao, Chengcheng; Lei, Ting; Song, Tze-Bin; Ke, Weijun; Yokoyama, Takamichi; Hou, Xun; Kanatzidis, Mercouri G.

doi:10.1002/adma.201606964

Title: Multichannel Interdiffusion Driven FASnI₃ Film Formation Using Aqueous Hybrid Salt/Polymer Solutions toward Flexible Lead-Free Perovskite Solar Cells

Journal Article · Tue Apr 11 00:00:00 EDT 2017 · Advanced Materials

DOI:https://doi.org/10.1002/adma.201606964· OSTI ID:1470367

Xi, Jun ^[1]; Wu, Zhaoxin ^[2]; Jiao, Bo ^[3]; Dong, Hua ^[1]; Ran, Chenxin ^[1]; Piao, Chengcheng ^[1]; Lei, Ting ^[1]; Song, Tze-Bin ^[4]; Ke, Weijun ^[4]; Yokoyama, Takamichi ^[5]; Hou, Xun ^[1]; Kanatzidis, Mercouri G. ^[4]

Xi'an Jiaotong Univ. (China)
Xi'an Jiaotong Univ. (China); Shanxi Univ. (China)
Xi'an Jiaotong Univ. (China); Northwestern Univ., Evanston, IL (United States)
Northwestern Univ., Evanston, IL (United States)
Northwestern Univ., Evanston, IL (United States); Mitsubishi Chemical Group Science & Technology Research Center, Inc., Yokohama (Japan)

Tin (Sn)‐based perovskites are increasingly attractive because they offer lead‐free alternatives in perovskite solar cells. However, depositing high‐quality Sn‐based perovskite films is still a challenge, particularly for low‐temperature planar heterojunction (PHJ) devices. Here, a “multichannel interdiffusion” protocol is demonstrated by annealing stacked layers of aqueous solution deposited formamidinium iodide (FAI)/polymer layer followed with an evaporated SnI ₂ layer to create uniform FASnI ₃ films. In this protocol, tiny FAI crystals, significantly inhibited by the introduced polymer, can offer multiple interdiffusion pathways for complete reaction with SnI ₂ . What is more, water, rather than traditional aprotic organic solvents, is used to dissolve the precursors. The best‐performing FASnI ₃ PHJ solar cell assembled by this protocol exhibits a power conversion efficiency (PCE) of 3.98%. In addition, a flexible FASnI ₃ ‐based flexible solar cell assembled on a polyethylene naphthalate–indium tin oxide flexible substrate with a PCE of 3.12% is demonstrated. This novel interdiffusion process can help to further boost the performance of lead‐free Sn‐based perovskites.

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Research Organization:: Northwestern Univ., Evanston, IL (United States). Energy Frontier Research Center (EFRC) Argonne-Northwestern Solar Energy Research Center (ANSER)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); China Scholarship Council

Grant/Contract Number:: SC0001059; DE‐SC0001059

OSTI ID:: 1470367

Alternate ID(s):: OSTI ID: 1401076

Journal Information:: Advanced Materials, Vol. 29, Issue 23; Related Information: ANSER partners with Northwestern University (lead); Argonne National Laboratory; University of Chicago; University of Illinois, Urbana-Champaign; Yale University; ISSN 0935-9648

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 157 works

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Title: Multichannel Interdiffusion Driven FASnI3 Film Formation Using Aqueous Hybrid Salt/Polymer Solutions toward Flexible Lead-Free Perovskite Solar Cells

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Title: Multichannel Interdiffusion Driven FASnI₃ Film Formation Using Aqueous Hybrid Salt/Polymer Solutions toward Flexible Lead-Free Perovskite Solar Cells