TY - JOUR
T1 - Dopant-Free Hole Transporting Polymers for High Efficiency, Environmentally Stable Perovskite Solar Cells
AU - Liao, Hsueh Chung
AU - Tam, Teck Lip Dexter
AU - Guo, Peijun
AU - Wu, Yilei
AU - Manley, Eric F.
AU - Huang, Wei
AU - Zhou, Nanjia
AU - Soe, Chan Myae Myae
AU - Wang, Binghao
AU - Wasielewski, Michael R.
AU - Chen, Lin X.
AU - Kanatzidis, Mercouri G.
AU - Facchetti, Antonio
AU - Chang, Robert P.H.
AU - Marks, Tobin J.
N1 - Funding Information:
H.-C.L. and T.L.D.T. contributed equally to this work. This research was supported by the ANSER Center, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, and Office of Basic Energy Sciences under Award Number DE-SC0001059. T.L.D.T acknowledges the Agency of Science, Technology and Research (A*STAR, Singapore) for a postdoctoral fellowship. H.-C.L. acknowledges the Ministry of Science and Technology of Taiwan for a postdoctoral fellowship. Use of the Advanced Photon Source, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Argonne National Laboratory, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357.
Publisher Copyright:
© 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2016/8/24
Y1 - 2016/8/24
N2 - Over the past five years, a rapid progress in organometal-halide perovskite solar cells has greatly influenced emerging solar energy science and technology. In perovksite solar cells, the overlying hole transporting material (HTM) is critical for achieving high power conversion efficiencies (PCEs) and for protecting the air-sensitive perovskite active layer. This study reports the synthesis and implementation of a new polymeric HTM series based on semiconducting 4,8-dithien-2-yl-benzo[1,2-d;4,5-d′]bistriazole-alt-benzo[1,2-b:4,5-b′]dithiophenes (pBBTa-BDTs), yielding high PCEs and environmentally-stable perovskite cells. These intrinsic (dopant-free) HTMs achieve a stabilized PCE of 12.3% in simple planar heterojunction cells—the highest value to date for a polymeric intrinsic HTM. This high performance is attributed to efficient hole extraction/collection (the most efficient pBBTa-BDT is highly ordered and orients π-face-down on the perovskite surface) and balanced electron/hole transport. The smooth, conformal polymer coatings suppress aerobic perovskite film degradation, significantly enhancing the solar cell 85 °C/65% RH PCE stability versus typical molecular HTMs.
AB - Over the past five years, a rapid progress in organometal-halide perovskite solar cells has greatly influenced emerging solar energy science and technology. In perovksite solar cells, the overlying hole transporting material (HTM) is critical for achieving high power conversion efficiencies (PCEs) and for protecting the air-sensitive perovskite active layer. This study reports the synthesis and implementation of a new polymeric HTM series based on semiconducting 4,8-dithien-2-yl-benzo[1,2-d;4,5-d′]bistriazole-alt-benzo[1,2-b:4,5-b′]dithiophenes (pBBTa-BDTs), yielding high PCEs and environmentally-stable perovskite cells. These intrinsic (dopant-free) HTMs achieve a stabilized PCE of 12.3% in simple planar heterojunction cells—the highest value to date for a polymeric intrinsic HTM. This high performance is attributed to efficient hole extraction/collection (the most efficient pBBTa-BDT is highly ordered and orients π-face-down on the perovskite surface) and balanced electron/hole transport. The smooth, conformal polymer coatings suppress aerobic perovskite film degradation, significantly enhancing the solar cell 85 °C/65% RH PCE stability versus typical molecular HTMs.
KW - carrier mobility
KW - perovskite solar cells
KW - polymeric hole transporting materials
KW - power-conversion-efficiencies
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U2 - 10.1002/aenm.201600502
DO - 10.1002/aenm.201600502
M3 - Article
AN - SCOPUS:84977111971
SN - 1614-6832
VL - 6
JO - Advanced Energy Materials
JF - Advanced Energy Materials
IS - 16
M1 - 1600502
ER -
