Publikation: Reduced defect density in crystalline halide perovskite films via methylamine treatment for the application in photodetectors
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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.
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SCHÜTZ, Emilia R., Azhar FAKHARUDDIN, Yenal YALCINKAYA, Efrain OCHOA-MARTINEZ, Shanti BIJANI, Abd. Rashid bin MOHD YUSOFF, Maria VASILOPOULOU, Tobias SEEWALD, Ullrich STEINER, Lukas SCHMIDT-MENDE, 2022. Reduced defect density in crystalline halide perovskite films via methylamine treatment for the application in photodetectors. In: APL Materials. American Institute of Physics (AIP). 2022, 10, 081110. eISSN 2166-532X. Verfügbar unter: doi: 10.1063/5.0093333BibTex
@article{Schutz2022Reduc-58424, year={2022}, doi={10.1063/5.0093333}, title={Reduced defect density in crystalline halide perovskite films via methylamine treatment for the application in photodetectors}, volume={10}, journal={APL Materials}, author={Schütz, Emilia R. and Fakharuddin, Azhar and Yalcinkaya, Yenal and Ochoa-Martinez, Efrain and Bijani, Shanti and Mohd Yusoff, Abd. Rashid bin and Vasilopoulou, Maria and Seewald, Tobias and Steiner, Ullrich and Schmidt-Mende, Lukas}, note={E.R.S., T.S., L.S.-M., Y.Y., and S.A.L.W. acknowledge the SPP2196 Project (Deutsche Forschungsgemeinschaft, DFG) for funding. Article Number: 081110} }
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