Interfacial crosslinked quasi-2D perovskite with boosted carrier transport and enhanced stability

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Abstract
The fabrication of 2D or quasi-2D perovskite has been a promising strategy to further modulate the electron structure and stability of lead halide perovskites. Here we demonstrate that an interfacial crosslinked 2D perovskite using a bifunctional butanediamine (BDA) cation as BDAPbI 4 exhibits similar optical properties as the regular butaneamine (BA) cation based BA 2 PbI 4 , but shows a different crystal growth preference and carrier transport properties. More remarkably, once BDAPbI 4 and CH 3 NH 3 PbI 3 (MAPbI 3 ) form a quasi-2D (BDA)(MA n −1 )Pb n I 3 n +1 perovskite with crosslinked 2D/3D configuration, superior photovoltaics performance than the regular 2D/3D (BA 2 ) (MA n −1 )Pb n I 3 n +1 can be obtained. The conducting atomic force microscopy measurements illustrate the interfacial crosslinked BDA based samples possess higher conductivities than regular ones. Thus, the strategy of cross-linked 2D/3D structure represents a simple and promising approach for designing novel perovskites for optoelectronic applications in future.
Funding Information
  • Huoyingdong Grant (151046)
  • National Natural Science Foundation of China (21621091)

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