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Congeneric Incorporation of CsPbBr_3 Nanocrystals in Hybrid Perovskite Heterojunction for Photovoltaic Efficiency Enhancement

Huachao Zai  Cheng Zhu  Yujing Li  Qi Chen  
【摘要】:Organic inorganic hybrid perovskite materials have had remarkable success in photovoltaics due to their superior optoelectronic properties and compositional abundance.Most advances focus on the improvement of the heterojunction, in which nonperovskite materials are employed at the pertaining interfaces. Herein we develop a simple and feasible approach to modify the perovskite absorber by utilizing congeneric lead halide perovskite NCs. We demonstrate the congeneric incorporation of CsPbBr_3 NCs into the perovskite heterojunction based on the absorber of FA_(0.85)MA_(0.15)Pb(I_(0.85)Br_(0.15))_3, wherein the CsPbBr_3 is congeneric to the absorber in terms of crystal structure and stoichiometry. The PV efficiency of the resultant device was enhanced from 17.95 to 19.45%, which was attributed to the efficient carrier transport behavior that originated from the synergetic improvements at both the absorber bulk and its adjacent interface. Appropriate band alignment is achieved to facilitate the hole extraction and to reduce recombination loss. By employing this strategy, we have achieved a best PCE of 20.56% in the resultant device. In addition, the incorporation of CsPbBr_3 NCs also improved the thermal stability of the corresponding devices. Therefore, our contribution suggests a universal strategy to modify the perovskite heterojunction in different aspects by the employment of congeneric materials in various building blocks, which ultimately paves the way for the practical use of hybrid perovskite materials.

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