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Title: Surface analytical investigation on organometal triiodide perovskite

Abstract

In a little over a year, there has been an unexpected breakthrough and rapid evolution of highly efficient solid-state hybrid solar cells based on organometal trihalide perovskite materials. This technology has the potential to produce solar cells with the very highest efficiencies while retaining the very lowest cost. The authors have measured the electronic density of states of CH3NH3PbI3 using ultraviolet photoemission spectroscopy (UPS), inverse photoemission spectroscopy (IPES), and x-ray photoemission spectroscopy(XPS). The valence band maximum and conduction band minimum positions are obtained from the UPS and IPES spectra, respectively, by linear extrapolation of the leading edges. The authors investigate the Au/perovskite and C60/perovskite interfaces by UPS and XPS. An interface dipole of 0.1 eV is observed at Au/perovskite interface. The energy levels of perovskite shift upward by ca.0.4 eV with Au coverage of 64 Å upon it, resulting in band bending, hence a built-in field in perovskite that encourages hole transport to the interface. The XPS results show a strong initial shift of core levels to lower binding energy in the perovskite, which indicates that electrons transfer from the perovskitefilm to fullerene molecules. Further deposition of fullerene forms C60 solid, accompanied by the reduction of the electron transfer. Asmore » a result, the strongest electron transfer happened at 1/4 monolayer of fullerene.« less

Authors:
 [1];  [2];  [1];  [3];  [3];  [3];  [3];  [1]
  1. Univ. of Rochester, Rochester, NY (United States)
  2. Central South Univ., Hunan (People's Republic of China)
  3. Univ. of Nebraska, Lincoln, NE (United States)
Publication Date:
Research Org.:
Univ. of Nebraska, Lincoln, NE (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1238031
Alternate Identifier(s):
OSTI ID: 1420581
Grant/Contract Number:  
EE0006709; Contract No. DE-AC02-98CH1-886
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Vacuum Science and Technology B
Additional Journal Information:
Journal Volume: 33; Journal Issue: 3; Journal ID: ISSN 2166-2746
Publisher:
American Vacuum Society / AIP
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; dielectric oxides; gold; thin films; solar cells; energy transfer

Citation Formats

Wang, Chenggong, Liu, Xiaoliang, Wang, Congcong, Xiao, Zhengguo, Bi, Cheng, Shao, Yuchuan, Huang, Jinsong, and Gao, Yongli. Surface analytical investigation on organometal triiodide perovskite. United States: N. p., 2015. Web. doi:10.1116/1.4915499.
Wang, Chenggong, Liu, Xiaoliang, Wang, Congcong, Xiao, Zhengguo, Bi, Cheng, Shao, Yuchuan, Huang, Jinsong, & Gao, Yongli. Surface analytical investigation on organometal triiodide perovskite. United States. https://doi.org/10.1116/1.4915499
Wang, Chenggong, Liu, Xiaoliang, Wang, Congcong, Xiao, Zhengguo, Bi, Cheng, Shao, Yuchuan, Huang, Jinsong, and Gao, Yongli. Fri . "Surface analytical investigation on organometal triiodide perovskite". United States. https://doi.org/10.1116/1.4915499. https://www.osti.gov/servlets/purl/1238031.
@article{osti_1238031,
title = {Surface analytical investigation on organometal triiodide perovskite},
author = {Wang, Chenggong and Liu, Xiaoliang and Wang, Congcong and Xiao, Zhengguo and Bi, Cheng and Shao, Yuchuan and Huang, Jinsong and Gao, Yongli},
abstractNote = {In a little over a year, there has been an unexpected breakthrough and rapid evolution of highly efficient solid-state hybrid solar cells based on organometal trihalide perovskite materials. This technology has the potential to produce solar cells with the very highest efficiencies while retaining the very lowest cost. The authors have measured the electronic density of states of CH3NH3PbI3 using ultraviolet photoemission spectroscopy (UPS), inverse photoemission spectroscopy (IPES), and x-ray photoemission spectroscopy(XPS). The valence band maximum and conduction band minimum positions are obtained from the UPS and IPES spectra, respectively, by linear extrapolation of the leading edges. The authors investigate the Au/perovskite and C60/perovskite interfaces by UPS and XPS. An interface dipole of 0.1 eV is observed at Au/perovskite interface. The energy levels of perovskite shift upward by ca.0.4 eV with Au coverage of 64 Å upon it, resulting in band bending, hence a built-in field in perovskite that encourages hole transport to the interface. The XPS results show a strong initial shift of core levels to lower binding energy in the perovskite, which indicates that electrons transfer from the perovskitefilm to fullerene molecules. Further deposition of fullerene forms C60 solid, accompanied by the reduction of the electron transfer. As a result, the strongest electron transfer happened at 1/4 monolayer of fullerene.},
doi = {10.1116/1.4915499},
journal = {Journal of Vacuum Science and Technology B},
number = 3,
volume = 33,
place = {United States},
year = {Fri Mar 20 00:00:00 EDT 2015},
month = {Fri Mar 20 00:00:00 EDT 2015}
}

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Works referencing / citing this record:

Dipole-field-assisted charge extraction in metal-perovskite-metal back-contact solar cells
text, January 2017