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An Open‐Circuit Voltage and Power Conversion Efficiency Study of Fullerene Ternary Organic Solar Cells Based on Oligomer/Oligomer and Oligomer/Polymer
Author(s) -
Zhang Guichuan,
Zhou Cheng,
Sun Chen,
Jia Xiaoe,
Xu Baomin,
Ying Lei,
Huang Fei,
Cao Yong
Publication year - 2017
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201700090
Subject(s) - oligomer , ternary operation , energy conversion efficiency , materials science , open circuit voltage , ternary numeral system , polymer , fullerene , conjugated system , organic solar cell , polymer solar cell , chemical engineering , polymer chemistry , voltage , chemistry , organic chemistry , optoelectronics , composite material , electrical engineering , computer science , programming language , engineering
Variations in the open‐circuit voltage ( V oc ) of ternary organic solar cells are systematically investigated. The initial study of these devices consists of two electron‐donating oligomers, S2 (two units) and S7 (seven units), and the electron‐accepting [6,6]‐phenyl C71 butyric acid methyl ester (PC 71 BM) and reveals that the V oc is continuously tunable due to the changing energy of the charge transfer state ( E ct ) of the active layers. Further investigation suggests that V oc is also continuously tunable upon change in E ct in a ternary blend system that consists of S2 and its corresponding polymer (P11):PC 71 BM. It is interesting to note that higher power conversion efficiencies can be obtained for both S2:S7:PC 71 BM and S2:P11:PC 71 BM ternary systems compared with their binary systems, which can be ascribed to an improved V oc due to the higher E ct and an improved fill factor due to the improved film morphology upon the incorporation of S2. These findings provide a new guideline for the future design of conjugated polymers for achieving higher performance of ternary organic solar cells.