TY - JOUR
T1 - An obvious improvement in the performance of ternary organic solar cells with "guest" donor present at the "host" donor/acceptor interface
AU - Bi, Peng Qing
AU - Wu, Bo
AU - Zheng, Fei
AU - Xu, Wei Long
AU - Yang, Xiao Yu
AU - Feng, Lin
AU - ZHU, Fu Rong
AU - Hao, Xiao Tao
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (No.11574181, 61275037), Research Fund for the Doctoral Program of Higher Education (Grant No. 20130131110004), the "National Young 1000 Talents" Program of China, and Research Grants Council of Hong Kong Special Administrative Region, China, Project No. T23-713/11, GRF/12303114.
PY - 2016/9/7
Y1 - 2016/9/7
N2 - A small-molecule material, 7,7-(4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b′]dithiophene-2,6-diyl)bis(6-fluoro-4-(5′-hexyl-[2,2′-bithiophen]-5-yl)benzo-[c] [1,2,5]thiadiazole) (p-DTS(FBTTH2)2), was used to modify the morphology and electron-transport properties of the polymer blend of poly(3-hexythiophene) (P3HT) and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) bulk heterojunctions. As a result, a 24% increase in the power-conversion efficiency (PCE) of the p-DTS(FBTTH2)2:P3HT:PC71BM ternary organic solar cells (OSCs) is obtained. The improvement in the performance of OSCs is attributed to the constructive energy cascade path in the ternary system that benefits an efficient Förster resonance energy/charge transfer process between P3HT and p-DTS(FBTTH2)2, thereby improving photocurrent generation. It is shown that p-DTS(FBTTH2)2 molecules engage themselves at the P3HT/PC71BM interface. A combination of absorption enhancement, efficient energy transfer process, and ordered nanomorphology in the ternary system favors exciton dissociation and charge transportation in the polymer bulk heterojunction. The finding of this work reveals that distribution of the appropriate "guest" donor at the "host" donor/acceptor interface is an effective approach for attaining high-performance OSCs.
AB - A small-molecule material, 7,7-(4,4-bis(2-ethylhexyl)-4H-silolo[3,2-b:4,5-b′]dithiophene-2,6-diyl)bis(6-fluoro-4-(5′-hexyl-[2,2′-bithiophen]-5-yl)benzo-[c] [1,2,5]thiadiazole) (p-DTS(FBTTH2)2), was used to modify the morphology and electron-transport properties of the polymer blend of poly(3-hexythiophene) (P3HT) and [6,6]-phenyl-C71-butyric acid methyl ester (PC71BM) bulk heterojunctions. As a result, a 24% increase in the power-conversion efficiency (PCE) of the p-DTS(FBTTH2)2:P3HT:PC71BM ternary organic solar cells (OSCs) is obtained. The improvement in the performance of OSCs is attributed to the constructive energy cascade path in the ternary system that benefits an efficient Förster resonance energy/charge transfer process between P3HT and p-DTS(FBTTH2)2, thereby improving photocurrent generation. It is shown that p-DTS(FBTTH2)2 molecules engage themselves at the P3HT/PC71BM interface. A combination of absorption enhancement, efficient energy transfer process, and ordered nanomorphology in the ternary system favors exciton dissociation and charge transportation in the polymer bulk heterojunction. The finding of this work reveals that distribution of the appropriate "guest" donor at the "host" donor/acceptor interface is an effective approach for attaining high-performance OSCs.
KW - charge collection
KW - energy/charge transfer
KW - morphology control
KW - synergistic effect
KW - ternary organic solar cells
UR - http://www.scopus.com/inward/record.url?scp=84986550358&partnerID=8YFLogxK
U2 - 10.1021/acsami.6b07612
DO - 10.1021/acsami.6b07612
M3 - Journal article
AN - SCOPUS:84986550358
SN - 1944-8244
VL - 8
SP - 23212
EP - 23221
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 35
ER -
