Electrochemically n-Doped CsPbBr3 Nanocrystal Thin Films

Sungyeon Heo, Kwangdong Roh, Fengyu Zhang, Steven E. Tignor, Andrew B. Bocarsly, Antoine Kahn, Barry P. Rand

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Electrochemical doping is a promising strategy to dope halide perovskites without introducing impurities into the lattice. However, n-type doping of halide perovskites remains challenging due to intrinsically limited electrochemical stability. Herein, we report electrochemically n-doped CsPbBr3 nanocrystal (NC) films within electrochemically stable potential windows (−0.9–0.5 V vs Ag/AgNO3). Compared to bulk films with limited accessible surface area for cation charge compensation, NC films show more efficient n-doping properties due to their porous nature. Electrochemically doped NC films exhibit Fermi level shifts, confirmed via electrochemical measurements, vacuum-Kelvin probe contact potential difference, and photoelectron spectroscopy. As a result, in situ conductivity measurements show increases when films are p- or n-doped. Furthermore, n-doped films show a photoluminescence intensity increase. Given that we remain within the electrochemically stable window, we suspect this is due to an alleviation of electron traps, likely a result of altering the charge state of the interstitial Br population.

Original languageEnglish
Pages (from-to)211-216
Number of pages6
JournalACS Energy Letters
Volume7
Issue number1
DOIs
StatePublished - 14 Jan 2022

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