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Title: Extremely reduced dielectric confinement in two-dimensional hybrid perovskites with large polar organics

Abstract

Two dimensional inorganic–organic hybrid perovskites (2D perovskites) suffer from not only quantum confinement, but also dielectric confinement, hindering their application perspective in devices involving the conversion of an optical input into current. In this report, we theoretically predict that an extremely low exciton binding energy can be achieved in 2D perovskites by using high dielectric-constant organic components. We demonstrate that in (HOCH2CH2NH3)2PbI4, whose organic material has a high dielectric constant of 37, the dielectric confinement is largely reduced, and the exciton binding energy is 20-times smaller than that in conventional 2D perovskites. As a result, the photo-induced excitons can be thermally dissociated efficiently at room temperature, as clearly indicated from femtosecond transient absorption measurements. In addition, the mobility is largely improved due to the strong screening effect on charge impurities. Such low dielectric-confined 2D perovskites show excellent carrier extraction efficiency, and outstanding humidity resistance compared to conventional 2D perovskites.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [3];  [1];  [4];  [1];  [1];  [5]; ORCiD logo [2]; ORCiD logo [2];  [3];  [4]; ORCiD logo [2];  [2];  [1]
  1. King Abdullah Univ. of Science and Technology (KAUST), Thuwai (Saudi Arabia). Computer, Electrical, and Mathematical Sciences and Engineering Division
  2. King Abdullah Univ. of Science and Technology (KAUST), Thuwai (Saudi Arabia). KAUST Solar Center, Physical Sciences and Engineering Division
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
  4. Univ. of California, Berkeley, CA (United States). Dept. of Electrical Engineering and Computer Sciences
  5. King Abdullah Univ. of Science and Technology (KAUST), Thuwai (Saudi Arabia). Core Lab.
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research
OSTI Identifier:
1638985
Grant/Contract Number:  
AC02-05CH11231; OSR-2016-CRG5-3005; FCC/1/3079-08-01
Resource Type:
Accepted Manuscript
Journal Name:
Communications Physics
Additional Journal Information:
Journal Volume: 1; Journal Issue: 1; Journal ID: ISSN 2399-3650
Publisher:
Springer Nature
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; electronic devices; photonic devices

Citation Formats

Cheng, Bin, Li, Ting-You, Maity, Partha, Wei, Pai-Chun, Nordlund, Dennis, Ho, Kang-Ting, Lien, Der-Hsien, Lin, Chun-Ho, Liang, Ru-Ze, Miao, Xiaohe, Ajia, Idris A., Yin, Jun, Sokaras, Dimosthenis, Javey, Ali, Roqan, Iman S., Mohammed, Omar F., and He, Jr-Hau. Extremely reduced dielectric confinement in two-dimensional hybrid perovskites with large polar organics. United States: N. p., 2018. Web. https://doi.org/10.1038/s42005-018-0082-8.
Cheng, Bin, Li, Ting-You, Maity, Partha, Wei, Pai-Chun, Nordlund, Dennis, Ho, Kang-Ting, Lien, Der-Hsien, Lin, Chun-Ho, Liang, Ru-Ze, Miao, Xiaohe, Ajia, Idris A., Yin, Jun, Sokaras, Dimosthenis, Javey, Ali, Roqan, Iman S., Mohammed, Omar F., & He, Jr-Hau. Extremely reduced dielectric confinement in two-dimensional hybrid perovskites with large polar organics. United States. https://doi.org/10.1038/s42005-018-0082-8
Cheng, Bin, Li, Ting-You, Maity, Partha, Wei, Pai-Chun, Nordlund, Dennis, Ho, Kang-Ting, Lien, Der-Hsien, Lin, Chun-Ho, Liang, Ru-Ze, Miao, Xiaohe, Ajia, Idris A., Yin, Jun, Sokaras, Dimosthenis, Javey, Ali, Roqan, Iman S., Mohammed, Omar F., and He, Jr-Hau. Thu . "Extremely reduced dielectric confinement in two-dimensional hybrid perovskites with large polar organics". United States. https://doi.org/10.1038/s42005-018-0082-8. https://www.osti.gov/servlets/purl/1638985.
@article{osti_1638985,
title = {Extremely reduced dielectric confinement in two-dimensional hybrid perovskites with large polar organics},
author = {Cheng, Bin and Li, Ting-You and Maity, Partha and Wei, Pai-Chun and Nordlund, Dennis and Ho, Kang-Ting and Lien, Der-Hsien and Lin, Chun-Ho and Liang, Ru-Ze and Miao, Xiaohe and Ajia, Idris A. and Yin, Jun and Sokaras, Dimosthenis and Javey, Ali and Roqan, Iman S. and Mohammed, Omar F. and He, Jr-Hau},
abstractNote = {Two dimensional inorganic–organic hybrid perovskites (2D perovskites) suffer from not only quantum confinement, but also dielectric confinement, hindering their application perspective in devices involving the conversion of an optical input into current. In this report, we theoretically predict that an extremely low exciton binding energy can be achieved in 2D perovskites by using high dielectric-constant organic components. We demonstrate that in (HOCH2CH2NH3)2PbI4, whose organic material has a high dielectric constant of 37, the dielectric confinement is largely reduced, and the exciton binding energy is 20-times smaller than that in conventional 2D perovskites. As a result, the photo-induced excitons can be thermally dissociated efficiently at room temperature, as clearly indicated from femtosecond transient absorption measurements. In addition, the mobility is largely improved due to the strong screening effect on charge impurities. Such low dielectric-confined 2D perovskites show excellent carrier extraction efficiency, and outstanding humidity resistance compared to conventional 2D perovskites.},
doi = {10.1038/s42005-018-0082-8},
journal = {Communications Physics},
number = 1,
volume = 1,
place = {United States},
year = {2018},
month = {11}
}

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