期刊
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
卷 46, 期 7, 页码 9748-9760出版社
WILEY-HINDAWI
DOI: 10.1002/er.7843
关键词
anti-solvent; interfacial affinity; perovskite crystallization; photodetector; precursor solution engineering
资金
- Korea Institute of Energy Technology Evaluation and Planning [20183010013820]
- Ministry of Trade, Industry and Energy [20017439]
- National Research Foundation of Korea [2019R1A2C1087653]
- National Research Foundation of Korea [2019R1A2C1087653] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
This study explores the physical principles of fabricating the photosensitive layer and proposes a novel perspective on the properties of anti-solvents. By selecting suitable aromatic solvents as anti-solvents, the interfacial affinity between perovskite and the electron transport layer can be optimized, resulting in a fast and highly sensitive photodetector.
For the development of the perovskite formation process, it is necessary to explore the principle of fabricating the photosensitive layer. Herein, a novel perspective on the physical properties of anti-solvents is proposed, which is related to perovskite crystallization. Specifically, we focus on aromatic solvents with different functional groups as anti-solvents (methylbenzene (MB) and chlorobenzene (CB)). This is because the precursor solubility depends on the interactions with each solvent, which is closely observed via FT-IR. In this context, the interfacial affinity of thin perovskite layer induced uniform morphology of electron transport layer (ETL). This phenomenon is characterized by FE-SEM, AFM, and XRD in detail. Based on these data, CB-treated perovskite photodetector exhibits superior detectivity and fast response speed owing to better interfacial affinity between perovskite and ETL. Also, improved charge dynamic behavior (dark current and impedance analysis) was observed in CB-treated condition. Therefore, it is demonstrated that the selection of anti-solvent is important to optimize morphological affinity between perovskite and interlayer in fabricating thin photosensitive layer, which contributes to realization of fast and highly sensitive photodetector.
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