DataVXACS Energy LettersPaper
journal article·2023-12-08

A Si-Substituted Spirobifluorene Hole-Transporting Material for Perovskite Solar Cells

Yanqi Luo, Ramesh Kumar Chitumalla, So-Yeon Ham, Deniz N. Cakan, Taewoo Kim, Sanghyun Paek, Ying Shirley Meng, Joonkyung Jang, David P. Fenning, Min-cheol Kim

ACS Energy Letters· Volume 8· Issue 12
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Source abstract

Abstract

Hybrid organic–inorganic perovskite solar cells (PSCs) have shown promise for next-generation photovoltaics. This study presents a simple approach for enhancing the performance and stability of PSCs by substituting the center carbon atom of the common hole transport material (HTM) Spiro-MeOTAD with a silicon atom. This modification, termed Si-Spiro, results in an increased hole mobility. A density functional theory simulation indicates that the enhanced hole mobility is due to the structural change of Si-Spiro. Electron beam-induced current microscopy measurements indicate improved charged extraction at the Si-Spiro/perovskite interface. A power conversion efficiency of 22.5% is achieved in Si-Spiro-based PSCs, outperforming standard Spiro-MeOTAD. Additionally, Si-Spiro-based PSCs demonstrate enhanced stability, maintaining over 90% of performance over 120 h of one-sun operation. Depth-profiling X-ray photoelectron spectroscopy revealed that Si-Spiro effectively blocks metal ion migration, which contributes to its enhanced stability. The findings suggest that Si-Spiro could be promising a HTM for high-performing, stable PSCs.
Source: openalex_inverted_index · Quality: baseline

Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Conducting polymers and applications · Organic Electronics and Photovoltaics

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

Affiliations

Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, United States

Department of Nanoenergy Engineering, Pusan National University, Busan, Republic of Korea, 46241

Materials Science and Engineering Program, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States

Department of NanoEngineering, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States

Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States

Department of Chemistry and Energy Engineering, Sangmyung University, Seoul, 03016, Republic of Korea

Pritzker School of Molecular Engineering, University of Chicago, Chicago, Illinois 60637, United States

School of Mechanical Engineering, Pusan National University, Busan 46241, Korea

Funding

National Research Foundation of Korea · California Energy Commission

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