Your browser doesn't support javascript.
loading
Conductivity Tuning via Doping with Electron Donating and Withdrawing Molecules in Perovskite CsPbI3 Nanocrystal Films.
Gaulding, E Ashley; Hao, Ji; Kang, Hyun Suk; Miller, Elisa M; Habisreutinger, Severin N; Zhao, Qian; Hazarika, Abhijit; Sercel, Peter C; Luther, Joseph M; Blackburn, Jeffrey L.
Afiliação
  • Gaulding EA; National Renewable Energy Laboratory, Golden, CO, 80401, USA.
  • Hao J; National Renewable Energy Laboratory, Golden, CO, 80401, USA.
  • Kang HS; National Renewable Energy Laboratory, Golden, CO, 80401, USA.
  • Miller EM; National Renewable Energy Laboratory, Golden, CO, 80401, USA.
  • Habisreutinger SN; National Renewable Energy Laboratory, Golden, CO, 80401, USA.
  • Zhao Q; National Renewable Energy Laboratory, Golden, CO, 80401, USA.
  • Hazarika A; College of Chemistry, Nankai University, Tianjin, 300071, China.
  • Sercel PC; National Renewable Energy Laboratory, Golden, CO, 80401, USA.
  • Luther JM; Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA, 91125, USA.
  • Blackburn JL; National Renewable Energy Laboratory, Golden, CO, 80401, USA.
Adv Mater ; 31(27): e1902250, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31074911
ABSTRACT
Doping of semiconductors enables fine control over the excess charge carriers, and thus the overall electronic properties, crucial to many technologies. Controlled doping in lead-halide perovskite semiconductors has thus far proven to be difficult. However, lower dimensional perovskites such as nanocrystals, with their high surface-area-to-volume ratio, are particularly well-suited for doping via ground-state molecular charge transfer. Here, the tunability of the electronic properties of perovskite nanocrystal arrays is detailed using physically adsorbed molecular dopants. Incorporation of the dopant molecules into electronically coupled CsPbI3 nanocrystal arrays is confirmed via infrared and photoelectron spectroscopies. Untreated CsPbI3 nanocrystal films are found to be slightly p-type with increasing conductivity achieved by incorporating the electron-accepting dopant 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4 TCNQ) and decreasing conductivity for the electron-donating dopant benzyl viologen. Time-resolved spectroscopic measurements reveal the time scales of Auger-mediated recombination in the presence of excess electrons or holes. Microwave conductance and field-effect transistor measurements demonstrate that both the local and long-range hole mobility are improved by F4 TCNQ doping of the nanocrystal arrays. The improved hole mobility in photoexcited p-type arrays leads to a pronounced enhancement in phototransistors.

Similares

MEDLINE

...
LILACS

LIS

Texto completo: Disponível Coleções: Bases de dados internacionais Base de dados: MEDLINE Idioma: Inglês Revista: Adv Mater Assunto da revista: Biofísica / Química Ano de publicação: 2019 Tipo de documento: Artigo País de afiliação: Estados Unidos