Reduced defect density in crystalline halide perovskite films via methylamine treatment for the application in photodetectors
Considerable efforts have been devoted to optimizing and controlling the morphology and electronic properties of lead halide perovskites. The defect density of a perovskite layer strongly depends on the processing conditions. Consequently, the fabrication process of high-quality films is often compl...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2022-08-01
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| Series: | APL Materials |
| Online Access: | http://dx.doi.org/10.1063/5.0093333 |
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| author | Emilia R. Schütz Azhar Fakharuddin Yenal Yalcinkaya Efrain Ochoa-Martinez Shanti Bijani Abd. Rashid bin Mohd Yusoff Maria Vasilopoulou Tobias Seewald Ullrich Steiner Stefan A. L. Weber Lukas Schmidt-Mende |
| author_facet | Emilia R. Schütz Azhar Fakharuddin Yenal Yalcinkaya Efrain Ochoa-Martinez Shanti Bijani Abd. Rashid bin Mohd Yusoff Maria Vasilopoulou Tobias Seewald Ullrich Steiner Stefan A. L. Weber Lukas Schmidt-Mende |
| author_sort | Emilia R. Schütz |
| collection | DOAJ |
| description | Considerable efforts have been devoted to optimizing and controlling the morphology and electronic properties of lead halide perovskites. The defect density of a perovskite layer strongly depends on the processing conditions. Consequently, the fabrication process of high-quality films is often complex, and reproducibility is a challenge. In this work, we present a methylamine gas-based method to recrystallize perovskite layers of any given quality in a controlled way, leading to millimeter-sized domains. Crystallinity significantly increases upon methylamine treatment, and crystal growth follows a preferred orientation. Photoluminescence- and space-charge limited current measurements show that the trap density halves after recrystallization. Conductive atomic force microscopy measurements show a higher surface conductivity and an improved spatial homogeneity after methylamine treatment. When applied in photodetectors, the improved film quality of the recrystallized films leads to increased detectivities of ≈4 × 1011 Jones compared to 3 × 109 Jones of a reference device. The response time falls from 0.1 to 10−5 s upon methylamine treatment. Our work, thus, presents a promising route to fabricating reproducible, high-quality perovskite films through well-controllable recrystallization. |
| first_indexed | 2024-12-10T05:56:24Z |
| format | Article |
| id | doaj.art-263c55cf254648608e5759a3b204710d |
| institution | Directory Open Access Journal |
| issn | 2166-532X |
| language | English |
| last_indexed | 2024-12-10T05:56:24Z |
| publishDate | 2022-08-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Materials |
| spelling | doaj.art-263c55cf254648608e5759a3b204710d2022-12-22T01:59:55ZengAIP Publishing LLCAPL Materials2166-532X2022-08-01108081110081110-1110.1063/5.0093333Reduced defect density in crystalline halide perovskite films via methylamine treatment for the application in photodetectorsEmilia R. Schütz0Azhar Fakharuddin1Yenal Yalcinkaya2Efrain Ochoa-Martinez3Shanti Bijani4Abd. Rashid bin Mohd Yusoff5Maria Vasilopoulou6Tobias Seewald7Ullrich Steiner8Stefan A. L. Weber9Lukas Schmidt-Mende10Department of Physics, University of Konstanz, D-78457 Konstanz, GermanyDepartment of Physics, University of Konstanz, D-78457 Konstanz, GermanyMax Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, GermanyAdolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, SwitzerlandUnidad de Nanotecnología, Centro de Supercomputador y Bioinnovación SCBI, Universidad de Málaga, Calle Severo Ochoa 34, 29590 Campanillas (Málaga), SpainDepartment of Chemical Engineering, Pohang University of Science and Technology (POSTECH) 77 Cheongam-Ro, Nam-Gu, Pohang 37673, Republic of KoreaInstitute of Nanoscience and Nanotechnology, National Center for Scientific Research “Demokritos,” 15341 Agia Paraskevi, Attica, GreeceDepartment of Physics, University of Konstanz, D-78457 Konstanz, GermanyAdolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, SwitzerlandMax Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, GermanyDepartment of Physics, University of Konstanz, D-78457 Konstanz, GermanyConsiderable efforts have been devoted to optimizing and controlling the morphology and electronic properties of lead halide perovskites. The defect density of a perovskite layer strongly depends on the processing conditions. Consequently, the fabrication process of high-quality films is often complex, and reproducibility is a challenge. In this work, we present a methylamine gas-based method to recrystallize perovskite layers of any given quality in a controlled way, leading to millimeter-sized domains. Crystallinity significantly increases upon methylamine treatment, and crystal growth follows a preferred orientation. Photoluminescence- and space-charge limited current measurements show that the trap density halves after recrystallization. Conductive atomic force microscopy measurements show a higher surface conductivity and an improved spatial homogeneity after methylamine treatment. When applied in photodetectors, the improved film quality of the recrystallized films leads to increased detectivities of ≈4 × 1011 Jones compared to 3 × 109 Jones of a reference device. The response time falls from 0.1 to 10−5 s upon methylamine treatment. Our work, thus, presents a promising route to fabricating reproducible, high-quality perovskite films through well-controllable recrystallization.http://dx.doi.org/10.1063/5.0093333 |
| spellingShingle | Emilia R. Schütz Azhar Fakharuddin Yenal Yalcinkaya Efrain Ochoa-Martinez Shanti Bijani Abd. Rashid bin Mohd Yusoff Maria Vasilopoulou Tobias Seewald Ullrich Steiner Stefan A. L. Weber Lukas Schmidt-Mende Reduced defect density in crystalline halide perovskite films via methylamine treatment for the application in photodetectors APL Materials |
| title | Reduced defect density in crystalline halide perovskite films via methylamine treatment for the application in photodetectors |
| title_full | Reduced defect density in crystalline halide perovskite films via methylamine treatment for the application in photodetectors |
| title_fullStr | Reduced defect density in crystalline halide perovskite films via methylamine treatment for the application in photodetectors |
| title_full_unstemmed | Reduced defect density in crystalline halide perovskite films via methylamine treatment for the application in photodetectors |
| title_short | Reduced defect density in crystalline halide perovskite films via methylamine treatment for the application in photodetectors |
| title_sort | reduced defect density in crystalline halide perovskite films via methylamine treatment for the application in photodetectors |
| url | http://dx.doi.org/10.1063/5.0093333 |
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