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Conductivity Tuning via Doping with Electron Donating and Withdrawing Molecules in Perovskite CsPbl₃ Nanocrystal Films

May 10, 2019 

Enhanced conductivity for p-type nanocrystal (NC) arrays enables significant improvements to field-effect transistors and phototransistors, which should, in turn, lead to performance improvements in light-detecting applications and solar cells.

Scientific Achievement

Molecular charge transfer dopants are used to tune charge carrier type and density within electronically coupled CsPbI₃ NC arrays. P-type doping significantly improves the carrier mobility, electrical conductivity, and photo-response of coupled NC arrays.

Significance and Impact

This doping strategy provides a generalizable path towards controlling carrier type and density within a broad array of nanostructured metal-halide perovskite semiconductors, for both understanding and controlling fundamental charge-related properties and for enabling next-generation opto-electronic devices.

Research Details

• CsPbI₃ NCs deposited into electronically coupled NC arrays
• N-type and p-type doping achieved via adsorption of redox-active molecular dopants into NC arrays
• Detailed spectroscopic and electrical measurements to understand ground/excited-state carrier transport 

DOI: 10.1002/adma.201902250