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Title: Perovskite Solar Cells with Near 100% Internal Quantum Efficiency Based on Large Single Crystalline Grains and Vertical Bulk Heterojunctions

Abstract

Grain boundaries (GBs) as defects in the crystal lattice detrimentally impact the power conversion efficiency (PCE) of polycrystalline solar cells, particularly in recently emerging hybrid perovskites where non-radiative recombination processes lead to significant carrier losses. Here, the beneficial effects of activated vertical GBs are demonstrated by first growing large, vertically-oriented methylammonium lead tri-iodide (CH3NH3PbI3) single-crystalline grains. We show that infiltration of p-type doped 2 -7,7 -tetrakis(N,Ndi-p-methoxyphenylamine)-9,9-spirobifluorene (Spiro-OMeTAD) into CH3NH3PbI3 films along the GBs creates space charge regions to suppress non-radiative recombination and enhance carrier collection efficiency. Solar cells with such activated GBs yielded average PCE of 16.3 ± 0.9%, which are among the best solution-processed perovskite devices. As an important alternative to growing ideal CH3NH3PbI3 single crystal films, which is difficult to achieve for such fast-crystallizing perovskites, activating GBs paves a way to design a new type of bulk heterojunction hybrid perovskite photovoltaics toward theoretical maximum PCE.

Authors:
 [1];  [2];  [1];  [1];  [1];  [2];  [1];  [1];  [2];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1209201
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 137; Journal Issue: 29; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY

Citation Formats

Yang, Bin, Dyck, Ondrej, Poplawsky, Jonathan, Keum, Jong, Puretzky, Alexander, Das, Sanjib, Ivanov, Ilia, Rouleau, Christopher, Duscher, Gerd, Geohegan, David, and Xiao, Kai. Perovskite Solar Cells with Near 100% Internal Quantum Efficiency Based on Large Single Crystalline Grains and Vertical Bulk Heterojunctions. United States: N. p., 2015. Web. https://doi.org/10.1021/jacs.5b03144.
Yang, Bin, Dyck, Ondrej, Poplawsky, Jonathan, Keum, Jong, Puretzky, Alexander, Das, Sanjib, Ivanov, Ilia, Rouleau, Christopher, Duscher, Gerd, Geohegan, David, & Xiao, Kai. Perovskite Solar Cells with Near 100% Internal Quantum Efficiency Based on Large Single Crystalline Grains and Vertical Bulk Heterojunctions. United States. https://doi.org/10.1021/jacs.5b03144
Yang, Bin, Dyck, Ondrej, Poplawsky, Jonathan, Keum, Jong, Puretzky, Alexander, Das, Sanjib, Ivanov, Ilia, Rouleau, Christopher, Duscher, Gerd, Geohegan, David, and Xiao, Kai. Thu . "Perovskite Solar Cells with Near 100% Internal Quantum Efficiency Based on Large Single Crystalline Grains and Vertical Bulk Heterojunctions". United States. https://doi.org/10.1021/jacs.5b03144. https://www.osti.gov/servlets/purl/1209201.
@article{osti_1209201,
title = {Perovskite Solar Cells with Near 100% Internal Quantum Efficiency Based on Large Single Crystalline Grains and Vertical Bulk Heterojunctions},
author = {Yang, Bin and Dyck, Ondrej and Poplawsky, Jonathan and Keum, Jong and Puretzky, Alexander and Das, Sanjib and Ivanov, Ilia and Rouleau, Christopher and Duscher, Gerd and Geohegan, David and Xiao, Kai},
abstractNote = {Grain boundaries (GBs) as defects in the crystal lattice detrimentally impact the power conversion efficiency (PCE) of polycrystalline solar cells, particularly in recently emerging hybrid perovskites where non-radiative recombination processes lead to significant carrier losses. Here, the beneficial effects of activated vertical GBs are demonstrated by first growing large, vertically-oriented methylammonium lead tri-iodide (CH3NH3PbI3) single-crystalline grains. We show that infiltration of p-type doped 2 -7,7 -tetrakis(N,Ndi-p-methoxyphenylamine)-9,9-spirobifluorene (Spiro-OMeTAD) into CH3NH3PbI3 films along the GBs creates space charge regions to suppress non-radiative recombination and enhance carrier collection efficiency. Solar cells with such activated GBs yielded average PCE of 16.3 ± 0.9%, which are among the best solution-processed perovskite devices. As an important alternative to growing ideal CH3NH3PbI3 single crystal films, which is difficult to achieve for such fast-crystallizing perovskites, activating GBs paves a way to design a new type of bulk heterojunction hybrid perovskite photovoltaics toward theoretical maximum PCE.},
doi = {10.1021/jacs.5b03144},
journal = {Journal of the American Chemical Society},
number = 29,
volume = 137,
place = {United States},
year = {2015},
month = {7}
}

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