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Georgia Journal of Science

Article Title

Air-stable Manganese-doped perovskite solar cells with enhanced light harvesting by dual color absorption

Abstract

Impurity doping can provide an additional level of control over optical, electronic, and magnetic functionalities of semiconductor nanocrystals. Among the common impurity dopants to date, Mn2+ has been particularly desirable because of the exchange coupling between the charge carriers of the host semiconductor and d electrons of the dopant, which opens new pathways for energy exchange or forms new coupled electronic states between exciton and dopant. In this project, Mn2+ has been attempted to dope the semiconductor perovskite CsPb1-xMnxI2Br to modulate the optical and electronic performance. X-ray diffraction reveals the quality crystalline of the Mn2+-doped CsPbI2Br, while ultra-violet and visible spectroscopy discloses the dual-color absorption peaks. One (370 nm) is located in violet range and the other in the blue with a wavelength of 430 nm. The additional absorption peak evidences that after doped with Mn2+, the light harvesting of CsPb1-xMnxI2Br is extended covering a wider range on the light spectrum. The enhanced light absorption of CsPb1-xMnxI2Br would boost the photovoltaic performance when it is constructed as a light absorber in a perovskite solar cell. Meanwhile, CsPb1-xMnxI2Br has demonstrated the long-term air stability, compared with its counterpart CsPbI2Br. Noteworthily, not only is the long lasting stability achieved by doping Mn2+ but also the lessened toxicity is realized by reducing the amount of hazardous lead in perovskite with harmless manganese.

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