Volume 8, Issue 4 1901186
Full Paper

Effective Preparation of Nanoscale CH3NH3PbI3 Perovskite Photosensitizers for Mesoporous TiO2-Based Solar Cells by Successive Precursor Layer Adsorption and Reaction Process

Myoung Kim

Myoung Kim

Department of Chemistry, Chonbuk National University, Jeonju, 561-756 South Korea

Department of Bioactive Material Sciences, Chonbuk National University, Jeonju, 561-756 South Korea

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Seul-Yi Lee

Seul-Yi Lee

Department of Chemistry, Chonbuk National University, Jeonju, 561-756 South Korea

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So-Min Yoo

So-Min Yoo

Department of Chemistry, Chonbuk National University, Jeonju, 561-756 South Korea

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Sanghyun Paek

Sanghyun Paek

Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL Valais, Sion, 1951 Switzerland

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Yonghui Lee

Yonghui Lee

Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL Valais, Sion, 1951 Switzerland

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Kyung Taek Cho

Kyung Taek Cho

Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL Valais, Sion, 1951 Switzerland

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Iwan Zimmermann

Iwan Zimmermann

Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL Valais, Sion, 1951 Switzerland

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Hae-Yeon Kim

Hae-Yeon Kim

Department of Chemistry, Chonbuk National University, Jeonju, 561-756 South Korea

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Beom-Seok Kim

Beom-Seok Kim

Department of Chemistry, Chonbuk National University, Jeonju, 561-756 South Korea

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Min-Kyeong Song

Min-Kyeong Song

Center for University-Wide Research Facilities (CURF), Chonbuk National University, Jeonju, 561-756 South Korea

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Taeho Shin

Taeho Shin

Department of Chemistry, Chonbuk National University, Jeonju, 561-756 South Korea

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Kyoungsoo Kim

Kyoungsoo Kim

Department of Chemistry, Chonbuk National University, Jeonju, 561-756 South Korea

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Aron J. Huckaba

Corresponding Author

Aron J. Huckaba

Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL Valais, Sion, 1951 Switzerland

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Mohammad Khaja Nazeeruddin

Corresponding Author

Mohammad Khaja Nazeeruddin

Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL Valais, Sion, 1951 Switzerland

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Hyo J. Lee

Corresponding Author

Hyo J. Lee

Department of Chemistry, Chonbuk National University, Jeonju, 561-756 South Korea

Department of Bioactive Material Sciences, Chonbuk National University, Jeonju, 561-756 South Korea

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First published: 14 November 2019
Citations: 2

Abstract

Nanoscale CH3NH3PbI3 perovskite sensitizers are grown by delivering each precursor successively onto the surface of mesoporous (meso) TiO2 electrodes. Using Pb(NO3)2 ions as a lead(II) source and CH3NH3I (MAI) for methylammonium and iodide sources, repetitive cycles of the two dipping steps are successful in growing few nanometer-sized MAPbI3 gradually on the TiO2 surface inside the meso-TiO2 film. However, some aggregates are observed on the top surface of the meso-TiO2 film due to slight dissolution of PbI2 and its accumulation/reaction with MAI at the top surface of the meso-TiO2 film. To solve this inhomogeneity of the deposition, a nondestructive multiple deposition route for nanoscale MAPbI3 is suggested as a successive precursor layer adsorption and reaction (SPLAR) process where, from the second cycle of deposition, PbI2 is delivered with the help of an ionic liquid compound dissolved in dichloromethane. With this new Pb precursor in less-polar solvents, nanoscale MAPbI3 sensitizers are grown without dissolution of preformed perovskites or formation of some aggregates at the top surface. After the third cycle of SPLAR deposition, about 7.0 nm–sized MAPbI3 sensitizers are prepared and display enhanced photovoltaic performance (7.18 ± 0.31%) compared with devices obtained from only one cycle (5.74 ± 0.30%).

Conflict of Interest

The authors declare no conflict of interest.

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