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Title: $N$-Type Surface Doping of MAPbI 3 via Charge Transfer from Small Molecules

Abstract

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 MAPbI 3 by surface doping the film with an organic dopant molecule: cobaltocene (Co(C 5H 5) 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.

Authors:
 [1]; ORCiD logo [1];  [1];  [2]; ORCiD logo [1]
  1. Univ. of California, Santa Barbara, CA (United States). Dept. of Materials
  2. 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
Publication Date:
Research Org.:
Univ. of California, Santa Barbara, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1594804
Grant/Contract Number:  
SC0012541
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Electronic Materials
Additional Journal Information:
Journal Volume: 4; Journal Issue: 7; Journal ID: ISSN 2199-160X
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; charge transfer; interface engineering; ohmic contacts; perovskite solar cells; surface doping; trap passivation

Citation Formats

Perry, Erin E., Labram, John G., Venkatesan, Naveen R., Nakayama, Hidenori, and Chabinyc, Michael L. $N$-Type Surface Doping of MAPbI3 via Charge Transfer from Small Molecules. United States: N. p., 2018. Web. doi:10.1002/aelm.201800087.
Perry, Erin E., Labram, John G., Venkatesan, Naveen R., Nakayama, Hidenori, & Chabinyc, Michael L. $N$-Type Surface Doping of MAPbI3 via Charge Transfer from Small Molecules. United States. doi:10.1002/aelm.201800087.
Perry, Erin E., Labram, John G., Venkatesan, Naveen R., Nakayama, Hidenori, and Chabinyc, Michael L. Sun . "$N$-Type Surface Doping of MAPbI3 via Charge Transfer from Small Molecules". United States. doi:10.1002/aelm.201800087. https://www.osti.gov/servlets/purl/1594804.
@article{osti_1594804,
title = {$N$-Type Surface Doping of MAPbI3 via Charge Transfer from Small Molecules},
author = {Perry, Erin E. and Labram, John G. and Venkatesan, Naveen R. and Nakayama, Hidenori and Chabinyc, Michael L.},
abstractNote = {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.},
doi = {10.1002/aelm.201800087},
journal = {Advanced Electronic Materials},
number = 7,
volume = 4,
place = {United States},
year = {2018},
month = {6}
}

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