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Title: Vacuum-Deposited Biternary Organic Photovoltaics

Abstract

Ternary blend organic photovoltaics (OPVs) have been introduced to improve solar spectral absorption and reduce energy losses beyond that of binary blend OPVs, but the difficulties in simultaneously optimizing the morphology of three molecular components results in devices that have generally exhibited performance inferior to analogous binary OPVs. In this paper, we introduce a small molecule-based bi-ternary OPV comprising two individual, vacuum deposited binary bulk heterojunctions fused at a planar junction without component intermixing. In contrast to previous reports where the open circuit voltage (V OC) of a conventional, blended ternary cell lies between that of the individual binaries, the V OC of the bi-ternary OPV corresponds to one of the constituent binaries, depending on the order in which they are stacked relative to the anode. Additionally, dipole-induced energy-level realignment between the two binary segments necessary to achieve maximum efficiency is observed only when using donor-acceptor-acceptor’ dipolar donors in the photoactive heterojunctions. The optimized bi-ternary OPV shows improved performance compared to its two constituent binary OPVs, achieving a power conversion efficiency of 10.6 ± 0.3% under AM 1.5G 1 sun (100 mW/cm 2) simulated illumination with V OC = 0.94 ± 0.01 V, a short circuit current density of 16.0more » ± 0.5 mA cm -2 and a fill factor of 0.70 ± 0.01.« less

Authors:
ORCiD logo [1];  [2]; ORCiD logo [1];  [3];  [1];  [3]; ORCiD logo [4]; ORCiD logo [5]
  1. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Electrical Engineering, Dept. of Material Science and Engineering, and Dept. of Physics
  2. Univ. of Michigan, Ann Arbor, MI (United States). Applied Physics Program
  3. National Taiwan Univ., Taipei (Taiwan). Dept. of Chemistry
  4. National Taiwan Univ., Taipei (Taiwan). Dept. of Chemistry; Academia Sinica, Taipei (Taiwan). Inst. of Atomic and Molecular Science
  5. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Electrical Engineering, Dept. of Material Science and Engineering, Dept. of Physics, and Applied Physics Program
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1573354
Grant/Contract Number:  
EE0008561
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 141; Journal Issue: 45; Journal ID: ISSN 0002-7863
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY

Citation Formats

Li, Yongxi, Sheriff, Hafiz K. M., Liu, Xiao, Wang, Chun-Kai, Ding, Kan, Han, Han, Wong, Ken-Tsung, and Forrest, Stephen R. Vacuum-Deposited Biternary Organic Photovoltaics. United States: N. p., 2019. Web. doi:10.1021/jacs.9b09012.
Li, Yongxi, Sheriff, Hafiz K. M., Liu, Xiao, Wang, Chun-Kai, Ding, Kan, Han, Han, Wong, Ken-Tsung, & Forrest, Stephen R. Vacuum-Deposited Biternary Organic Photovoltaics. United States. doi:10.1021/jacs.9b09012.
Li, Yongxi, Sheriff, Hafiz K. M., Liu, Xiao, Wang, Chun-Kai, Ding, Kan, Han, Han, Wong, Ken-Tsung, and Forrest, Stephen R. Thu . "Vacuum-Deposited Biternary Organic Photovoltaics". United States. doi:10.1021/jacs.9b09012.
@article{osti_1573354,
title = {Vacuum-Deposited Biternary Organic Photovoltaics},
author = {Li, Yongxi and Sheriff, Hafiz K. M. and Liu, Xiao and Wang, Chun-Kai and Ding, Kan and Han, Han and Wong, Ken-Tsung and Forrest, Stephen R.},
abstractNote = {Ternary blend organic photovoltaics (OPVs) have been introduced to improve solar spectral absorption and reduce energy losses beyond that of binary blend OPVs, but the difficulties in simultaneously optimizing the morphology of three molecular components results in devices that have generally exhibited performance inferior to analogous binary OPVs. In this paper, we introduce a small molecule-based bi-ternary OPV comprising two individual, vacuum deposited binary bulk heterojunctions fused at a planar junction without component intermixing. In contrast to previous reports where the open circuit voltage (VOC) of a conventional, blended ternary cell lies between that of the individual binaries, the VOC of the bi-ternary OPV corresponds to one of the constituent binaries, depending on the order in which they are stacked relative to the anode. Additionally, dipole-induced energy-level realignment between the two binary segments necessary to achieve maximum efficiency is observed only when using donor-acceptor-acceptor’ dipolar donors in the photoactive heterojunctions. The optimized bi-ternary OPV shows improved performance compared to its two constituent binary OPVs, achieving a power conversion efficiency of 10.6 ± 0.3% under AM 1.5G 1 sun (100 mW/cm2) simulated illumination with VOC = 0.94 ± 0.01 V, a short circuit current density of 16.0 ± 0.5 mA cm-2 and a fill factor of 0.70 ± 0.01.},
doi = {10.1021/jacs.9b09012},
journal = {Journal of the American Chemical Society},
number = 45,
volume = 141,
place = {United States},
year = {2019},
month = {10}
}

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