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Title: $$N$$-Type Surface Doping of MAPbI3 via Charge Transfer from Small Molecules

Journal Article · · Advanced Electronic Materials
 [1]; ORCiD logo [2];  [2];  [3]; ORCiD logo [2]
  1. Univ. of California, Santa Barbara, CA (United States). Dept. of Materials; University of California, Santa Barbara
  2. Univ. of California, Santa Barbara, CA (United States). Dept. of Materials
  3. Mitsubishi Chemical Corporation (Japan). Yokohama R&D Center; Univ. of California, Santa Barbara, CA (United States). Dept. of Materials and Mitsubishi Chemical Center for Advanced Materials
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Organic hole and electron transport materials are regularly employed as electron- and hole-blocking layers in perovskite thin-film solar cells. In order to optimize charge-extraction in the device, these organic layers can be doped using organic small molecules. However, to date there has been little work carried out on direct doping of perovskite surfaces. In this report, we study the change in electrical properties of thin films of MAPbI3 by surface doping the film with an organic dopant molecule: cobaltocene (Co(C5H5)2). By varying the quantity of cobaltocene deposited, the conductivity of MAPbI3 thin films are observed to be tunable over several orders of magnitude. We observe a tunable shift in the Fermi level illustrating that charge transfer doping enables control over the interfacial energy levels. An increase in photoconductivity is seen at intermediate doping levels, indicating passivation of surface traps confirmed by increased photolumeniscence. In conclusion, this model system provides a means to understand more complex heterointerfaces of doped organic blends at perovskite surfaces.

Research Organization:
Univ. of California, Santa Barbara, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
SC0012541
OSTI ID:
1594804
Journal Information:
Advanced Electronic Materials, Journal Name: Advanced Electronic Materials Journal Issue: 7 Vol. 4; ISSN 2199-160X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (3)

Recent Advances in Energetics and Stability of Metal Halide Perovskites for Optoelectronic Applications journal December 2018
A Review on Additives for Halide Perovskite Solar Cells journal April 2020
Efficient CsSnI 3 -based inorganic perovskite solar cells based on a mesoscopic metal oxide framework via incorporating a donor element journal January 2020

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36 MATERIALS SCIENCE
charge transfer
interface engineering
ohmic contacts
perovskite solar cells
surface doping
trap passivation