DataVXACS Energy LettersPaper
journal article·2024-01-12

Stabilizing α-Phase FAPbI3 Perovskite Induced by an Ordered Solvated Quasi-Crystalline PbI2

Yalan Zhang, Tinghuan Yang, Sang-Uk Lee, Shengzhong Liu, Kui Zhao, Nam-Gyu Park

ACS Energy Letters· Volume 9· Issue 1
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Source abstract

Abstract

In the two-step procedure for preparing a perovskite film, the chemistry of the PbI 2 solution plays an important role in determining the phase stability of perovskite films. We report here sulfoxonium salt-controlled crystallization for stabilizing α-phase formamidinium lead iodide (FAPbI 3 ) in perovskite solar cells via additive engineering of the PbI 2 solution. The in situ grazing incidence wide-angle X-ray scattering studies reveal that the trimethylsulfoxonium iodide (TMSOI) additive leads to an ordered solvated quasi-crystalline PbI 2, which facilitates the transformation to α-phase FAPbI 3 at room temperature while reacting PbI 2 with FAI. As a result, the photovoltaic performance and stability of the perovskite solar cells are enhanced due to the improved optoelectronic properties of the perovskite films. A best-performing device shows a power conversion efficiency of 24.65% at one sun illumination. The unencapsulated devices stored at room temperature under 30–40% relative humidity maintain 96.40% of their initial efficiency after 1000 h.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Solid-state spectroscopy and crystallography · Quantum Dots Synthesis And Properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Chemical Engineering and Center for Antibonding Regulated Crystals, Sungkyunkwan University, Suwon 16419, Republic of Korea

Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education; Shaanxi Key Laboratory for Advanced Energy Devices; Shaanxi Engineering Lab for Advanced Energy Technology; Institute for Advanced Energy Materials; School of Materials Science and Engineering, Shaanxi Normal University, Xi’an 710119, China

Dalian National Laboratory for Clean Energy, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

SKKU Institute of Energy Science and Technology (SIEST), Sungkyunkwan University, Suwon 16419, Republic of Korea

Funding

National Research Foundation of Korea · Korea Evaluation Institute of Industrial Technology

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