Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
DOI: https://doi.org/10.29363/nanoge.ap-hopv.2018.023
Publication date: 27th October 2017
Lead-free photovoltaic devices based on methylammonium tin iodide (CH3NH3SnI3) perovskite material is designed as a less toxic alternative to CH3NH3PbI3. CH3NH3SnI3 has a broader absorption to 950 nm and can be easily tuned by adjusting the perovskite composition. Specifically, Bromine (Br) incorporation has been shown to affect the controlling band gap of perovskite absorber layers, leading to cover the visible range of optical spectra. A series of tin-based mixed halide perovskite (CH3NH3Sn(I1-xBrx)3) were fabricated. We found that the optimized Sn-based mixed halide perovskite, CH3NH3Sn(I0.33Br0.67)3 exhibits 3.2% in comparison to original CH3NH3SnI3 (1.17%). In this study, we investigated the local electrical and optical properties of CH3NH3Sn(I1-xBrx)3 (0 ≤ x ≤ 1) thin-films by using scanning probe microscopy and Raman scattering spectroscopy. Based on that, we can describe the electron-hole carrier transport with various I/Br compositional ratio. Consequently, we can suggest the correlation of the local composition and electrical properties in perovskite layer depending on the Br concentration. Thus, we can anticipate the origin of the high efficiency perovskite solar cells with optimal Br concentration.
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International Conference on Hybrid and Organic Photovoltaics
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