April 22 - 26, 2024
Seattle, Washington
May 7 - 9, 2024 (Virtual)
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2024 MRS Spring Meeting & Exhibit
EN10.12.07

Effective Addition of Cation and halides in FAPbI3 Perovskite Solar Cells by Multiple Thermal Co-EvaporatioH

When and Where

Apr 25, 2024
9:45am - 10:00am
Room 334, Level 3, Summit

Presenter(s)

Co-Author(s)

Ha Kyung Park1,William Jo1

Ewha Womans University1

Abstract

Ha Kyung Park1,William Jo1

Ewha Womans University1
Metal halide perovskite solar cells (PSCs) have rapidly advanced as a next-generation solar cells with high efficiency over 25%. Among the various fabrication methods for the perovskite, thermal evaporation stands out as a suitable option for scaling up commercialization. However, achieving precise stoichiometry with multiple sources is challenging when using a co-evaporation method due to their varying volatility. In this study, multiple co-evaporation method was designed to fabricate the stoichiometrically mixed cation and halides PSCs using two sources. Formamidinium iodide (FAI) and lead iodide (PbI2) were co-evaporated followed by the co-evaporation of methylammonium iodide (MAI) and PbI2 or methylammonium bromide (MABr) and lead bromide (PbBr2). The deposition rates and thickness of secondly co-evaporated layer were controlled to achieve stoichiometry of mixed cations and halides precursors. After that, samples were annealed to form FAPbI3, (FA,MA)PbI3, and (FA,MA)Pb(I,Br)3 films. The completed PSCs were semi fully-vacuum-deposited, except for the hole transport layer. Among the samples, (FA,MA)Pb(I,Br)3 solar cells showed the highest performance of 11.38% efficiency with improved open-circuit voltage of 25 mV and current-voltage hysteresis. Herein, band gap of MA and Br added FAPbI3 slightly increased indicating only small amount of MAPbI3 and MAPbBr3 phases formed. Still, mixed cations samples showed improved absorbance compared to FA cation only sample. In conclusion, multiple co-evaporation is effective method for mixing cations and halides in PSCs.

Keywords

perovskites | physical vapor deposition (PVD)

Symposium Organizers

Ivan Mora-Sero, Universitat Jaume I
Michael Saliba, University of Stuttgart
Carolin Sutter-Fella, Lawrence Berkeley National Laboratory
Yuanyuan Zhou, Hong Kong University of Science and Technology

Symposium Support

Silver
Journal of Energy Chemistry

Session Chairs

Virgil Andrei
Hin-Lap Yip

In this Session