کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6469803 1424103 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ba2+ Doped CH3NH3PbI3 to Tune the Energy State and Improve the Performance of Perovskite Solar Cells
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Ba2+ Doped CH3NH3PbI3 to Tune the Energy State and Improve the Performance of Perovskite Solar Cells
چکیده انگلیسی


- Ba doping enlarges the energy band gap of MAPb1-xBaxI3.
- Voc and Jsc are enhanced in perovskite solar cells.
- DFT calculation proves the experiment results.

Elements substitution and doping in perovskite CH3NH3PbI3 exhibit versatile tunability of energy band structure and opto-electric properties. Ba2+ is chosen to substitute Pb2+ for its similar valence state and ionic radius with Pb2+. Ba2+ doping in perovskite (mol% <5) slightly enlarges the optic energy gap by conduction band minimum(CBM) upshifting to vacuum energy level, which is due to the smaller electronegativity of Ba than Pb. The enlarged band gap is also verified by density function theory calculations. In n-i-p structure perovskite solar cells (PSCs), because of the higher CBM of doped perovskite, the Fermi energy difference between n and p side is enlarged and the electron injection from the perovskite to TiO2 is improved. Thus, both the photovoltage and photocurrent are improved by small amount Ba2+ doping, resulting optimized 17.4% efficiency under AM1.5. This work reveals the relationship between the doping element property and the energy band structure of the perovskite, and highlights the doping method to improve the performance of PSCs.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 254, 10 November 2017, Pages 165-171
نویسندگان
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