TY - JOUR
T1 - Naphthobistriazole-based wide bandgap donor polymers for efficient non-fullerene organic solar cells
T2 - Significant fine-tuning absorption and energy level by backbone fluorination
AU - Tang, Dongsheng
AU - Wan, Jiahui
AU - Xu, Xiaopeng
AU - Lee, Young Woong
AU - Woo, Han Young
AU - Feng, Kui
AU - Peng, Qiang
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (51573107, 91633301 and 21432005), the Foundation of State Key Laboratory of Polymer Materials Engineering of China (sklpme2017-2-04) and the Fundamental Research Funds for the Central Universities of China (2012017yjsy109).
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2018/11
Y1 - 2018/11
N2 - In this work, two wide bandgap polymers of PDTT-TZNT and PDTF-TZNT were developed by Stille-coupling of naphtho[1,2-c:5,6-c]bis(2-octyl-[1,2,3]triazole) (TZNT) acceptor unit with bithiophene (DTH) and fluorinated bithiophene (DTF), respectively. These polymers exhibited a wide bandgap over 1.84 eV. The fluorinated PDTF-TZNT had lower highest occupied molecular orbital HOMO level (− 5.24 eV), higher molar absorption coefficient (1.28 × 105 M−1 cm−1), and higher molecular packing order. Using a low bandgap 3,9-bis(2-methylene-(5&6-methyl-(3-(1,1-dicyanomethylene)-indanone)))−5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]-dithiophene (IT-M) as the electron acceptor, the PDTF-TZNT:IT-M devices generated a higher power conversion efficiency (PCE) of 10.05%. To make up the weak absorption of above binary blend of PDTF-TZNT:IT-M in the short wavelength region and increase the device performance further, a large bandgap small molecular acceptor of 5,5,10,10,15,15-hexabutyl-2,7,12-tri(4-(3-ethylhexyl-4-oxothiazolidine-2-yl)dimalononitrile-benzothiadiazole)-truxene (meta-TrBRCN) was added as the second acceptor material to fabricate ternary blend PSCs. The meta-TrBRCN could not only expand the absorption range but also fine-tune the blend morphology by stepwise changing its content. When 0.2 of meta-TrBRCN was added, the PCE of PDTF-TZNT:IT-M devices was improved to 11.48%.
AB - In this work, two wide bandgap polymers of PDTT-TZNT and PDTF-TZNT were developed by Stille-coupling of naphtho[1,2-c:5,6-c]bis(2-octyl-[1,2,3]triazole) (TZNT) acceptor unit with bithiophene (DTH) and fluorinated bithiophene (DTF), respectively. These polymers exhibited a wide bandgap over 1.84 eV. The fluorinated PDTF-TZNT had lower highest occupied molecular orbital HOMO level (− 5.24 eV), higher molar absorption coefficient (1.28 × 105 M−1 cm−1), and higher molecular packing order. Using a low bandgap 3,9-bis(2-methylene-(5&6-methyl-(3-(1,1-dicyanomethylene)-indanone)))−5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2′,3′-d′]-s-indaceno[1,2-b:5,6-b′]-dithiophene (IT-M) as the electron acceptor, the PDTF-TZNT:IT-M devices generated a higher power conversion efficiency (PCE) of 10.05%. To make up the weak absorption of above binary blend of PDTF-TZNT:IT-M in the short wavelength region and increase the device performance further, a large bandgap small molecular acceptor of 5,5,10,10,15,15-hexabutyl-2,7,12-tri(4-(3-ethylhexyl-4-oxothiazolidine-2-yl)dimalononitrile-benzothiadiazole)-truxene (meta-TrBRCN) was added as the second acceptor material to fabricate ternary blend PSCs. The meta-TrBRCN could not only expand the absorption range but also fine-tune the blend morphology by stepwise changing its content. When 0.2 of meta-TrBRCN was added, the PCE of PDTF-TZNT:IT-M devices was improved to 11.48%.
KW - Fluorination
KW - Naphtho[1,2-c:5,6-c]bis(2-octyl-[1,2,3]triazole)
KW - Non-fullerene polymer solar cells
KW - Ternary blend solar cells
KW - Wide bandgap polymer donors
UR - http://www.scopus.com/inward/record.url?scp=85054091487&partnerID=8YFLogxK
U2 - 10.1016/j.nanoen.2018.08.059
DO - 10.1016/j.nanoen.2018.08.059
M3 - Article
AN - SCOPUS:85054091487
SN - 2211-2855
VL - 53
SP - 258
EP - 269
JO - Nano Energy
JF - Nano Energy
ER -