Multichannel Interdiffusion Driven FASnI 3  Film Formation Using Aqueous Hybrid Salt/Polymer Solutions toward Flexible Lead‐Free Perovskite Solar Cells | Zendy

Xi Jun | Zendy; Wu Zhaoxin | Zendy; Jiao Bo | Zendy; Dong Hua | Zendy; Ran Chenxin | Zendy; Piao Chengcheng | Zendy; Lei Ting | Zendy; Song TzeBin | Zendy; Ke Weijun | Zendy; Yokoyama Takamichi | Zendy; Hou Xun | Zendy; Kanatzidis Mercouri G. | Zendy

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Multichannel Interdiffusion Driven FASnI 3 Film Formation Using Aqueous Hybrid Salt/Polymer Solutions toward Flexible Lead‐Free Perovskite Solar Cells

Author(s) -

Xi Jun,

Wu Zhaoxin,

Jiao Bo,

Dong Hua,

Ran Chenxin,

Piao Chengcheng,

Lei Ting,

Song TzeBin,

Ke Weijun,

Yokoyama Takamichi,

Hou Xun,

Kanatzidis Mercouri G.

Publication year - 2017

Publication title -

advanced materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 10.707

H-Index - 527

eISSN - 1521-4095

pISSN - 0935-9648

DOI - 10.1002/adma.201606964

Subject(s) - materials science , perovskite (structure) , aqueous solution , salt (chemistry) , polymer , lead (geology) , chemical engineering , salt solution , nanotechnology , composite material , organic chemistry , chemistry , engineering , geomorphology , geology

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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