TY - JOUR
T1 - A wide-bandgap polymer based on the alkylphenyl-substituted benzo[1,2- b:4,5- b′]dithiophene unit with high power conversion efficiency of over 11%
AU - Guo, Xia
AU - Li, Wanbin
AU - Guo, Huan
AU - Guo, Bing
AU - Wu, Jingnan
AU - Ma, Wei
AU - Zhang, Maojie
AU - Wong, Wai Yeung
N1 - Funding Information:
This study was supported by National Natural Science Foundation of China (NSFC) (No. 51503135, 51573120 and 51773142), the Priority Academic Program Development of Jiangsu Higher Education Institutions, Jiangsu Provincial Natural Science Foundation (Grant No. BK20150332). W.-Y. W. thanks the nancial support from the Areas of Excellence Scheme, University Grants Committee, HKSAR (AoE/P-03/08), Hong Kong Research Grants Council (PolyU123384/16P), Hong Kong Polytechnic University (1-ZE1C) and the Endowment fund from Ms Clarea Au (847S). X. G. also acknowledges the support from the Hong Kong Scholars Program. X-ray data was acquired at beamlines 7.3.3 at the Advanced Light Source, which is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The authors thank Dr Chenhui Zhu at beamline 7.3.3 and Cheng Wang at beamline 11.0.1.2 for assistance with data acquisition.
PY - 2018
Y1 - 2018
N2 - A novel wide-bandgap conjugated polymer (PTZP) based on alkylphenyl-substituted benzo[1,2-b:4,5-b′]dithiophene (BDT-P) as the electron-rich unit and thiazolo[5,4-d]thiazole (TTz) as the electron-deficient unit was designed and synthesized for the non-fullerene polymer solar cell (PSCs) application. The polymer exhibited a wide bandgap of 2.01 eV with a strong absorption in the range of 300-620 nm, which was complementary with that of the fused-ring small molecule acceptor (SMA; 2,2′-((2Z,2′Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b′]dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile, IDIC). Also, the polymer exhibits a deep highest occupied molecular orbital (HOMO) energy level of -5.41 eV. Furthermore, the polymer film possesses strong crystallinity and dominated face-on stacking with a small d-spacing of 3.65 Å, resulting in a high hole mobility of 4.01 × 10-3 cm2 V-1 s-1. The optimal PSCs based on the PTZP:IDIC blend showed a high PCE of 11.8% with an open-circuit voltage (Voc) of 0.90 V, a short-circuit current density (Jsc) of 17.9 mA cm-2 and a fill factor (FF) of 73.3%. Moreover, the device with an active layer thickness of up to 200 nm or area of up to 0.81 cm2 exhibited outstanding performance, with PCE of over 10%, resulting from the excellent molecular stacking. These results revealed that PTZP will be a promising conjugated polymer for the fabrication of efficient large-area PSCs.
AB - A novel wide-bandgap conjugated polymer (PTZP) based on alkylphenyl-substituted benzo[1,2-b:4,5-b′]dithiophene (BDT-P) as the electron-rich unit and thiazolo[5,4-d]thiazole (TTz) as the electron-deficient unit was designed and synthesized for the non-fullerene polymer solar cell (PSCs) application. The polymer exhibited a wide bandgap of 2.01 eV with a strong absorption in the range of 300-620 nm, which was complementary with that of the fused-ring small molecule acceptor (SMA; 2,2′-((2Z,2′Z)-((4,4,9,9-tetrahexyl-4,9-dihydro-s-indaceno[1,2-b:5,6-b′]dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile, IDIC). Also, the polymer exhibits a deep highest occupied molecular orbital (HOMO) energy level of -5.41 eV. Furthermore, the polymer film possesses strong crystallinity and dominated face-on stacking with a small d-spacing of 3.65 Å, resulting in a high hole mobility of 4.01 × 10-3 cm2 V-1 s-1. The optimal PSCs based on the PTZP:IDIC blend showed a high PCE of 11.8% with an open-circuit voltage (Voc) of 0.90 V, a short-circuit current density (Jsc) of 17.9 mA cm-2 and a fill factor (FF) of 73.3%. Moreover, the device with an active layer thickness of up to 200 nm or area of up to 0.81 cm2 exhibited outstanding performance, with PCE of over 10%, resulting from the excellent molecular stacking. These results revealed that PTZP will be a promising conjugated polymer for the fabrication of efficient large-area PSCs.
UR - http://www.scopus.com/inward/record.url?scp=85052689151&partnerID=8YFLogxK
U2 - 10.1039/c8ta05868g
DO - 10.1039/c8ta05868g
M3 - Journal article
AN - SCOPUS:85052689151
SN - 2050-7488
VL - 6
SP - 16529
EP - 16536
JO - Journal of Materials Chemistry A
JF - Journal of Materials Chemistry A
IS - 34
ER -
