Multichannel Interdiffusion Driven FASnI3 Film Formation Using Aqueous Hybrid Salt/Polymer Solutions toward Flexible Lead-Free Perovskite Solar Cells
- 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. Yet, depositing high-quality Sn-based perovskite films is still a challenge, particularly for low-temperature planar heterojunction (PHJ) devices. In this work, a “multichannel interdiffusion” protocol is demonstrated by annealing stacked layers of aqueous solution deposited formamidinium iodide (FAI)/polymer layer followed with an evaporated SnI2 layer to create uniform FASnI3 films. In this protocol, tiny FAI crystals, significantly inhibited by the introduced polymer, can offer multiple interdiffusion pathways for complete reaction with SnI2. What is more, water, rather than traditional aprotic organic solvents, is used to dissolve the precursors. The best-performing FASnI3 PHJ solar cell assembled by this protocol exhibits a power conversion efficiency (PCE) of 3.98%. In addition, a flexible FASnI3-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 aid to further boost the performance of lead-free Sn-based perovskites.
- Research Organization:
- Northwestern Univ., Evanston, IL (United States). Energy Frontier Research Center (EFRC) Argonne-Northwestern Solar Energy Research Center (ANSER)
- Sponsoring Organization:
- China Scholarship Council; National Natural Science Foundation of China (NNSFC); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- SC0001059
- OSTI ID:
- 1470367
- Alternate ID(s):
- OSTI ID: 1401076
- Journal Information:
- Advanced Materials, Journal Name: Advanced Materials Journal Issue: 23 Vol. 29; ISSN 0935-9648
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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