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Ternary Organic Solar Cells with Reduced Graphene Oxide–Sb 2 S 3 Hybrid Nanosheets as the Cascade Material
Author(s) -
Balis Nikolaos,
Konios Dimitrios,
Stratakis Emmanuel,
Kymakis Emmanuel
Publication year - 2015
Publication title -
chemnanomat
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.947
H-Index - 32
ISSN - 2199-692X
DOI - 10.1002/cnma.201500044
Subject(s) - graphene , materials science , homo/lumo , ternary operation , photocurrent , carbazole , oxide , hybrid solar cell , antimony , cascade , polymer solar cell , chemical engineering , solar cell , nanotechnology , optoelectronics , photochemistry , chemistry , organic chemistry , molecule , computer science , engineering , metallurgy , programming language
We demonstrate that the efficiency of a poly[N‐9′‐heptadecanyl‐2,7‐carbazole‐alt‐5,5‐(4′,7′‐di‐2‐thienyl‐2′,1′,3′‐benzothiadiazole)](PCDTBT):[6,6]‐phenyl‐C 71 ‐butyric‐acid‐methyl‐ester (PC 71 BM) bulk heterojunction solar cell can be improved from 5.53 % to 6.81 % by incorporating reduced graphene oxide–antimony sulfide (rGO–Sb 2 S 3 ) hybrid nanosheets as the third component. By using this hybrid as the cascade material, we combine the ultra‐conductive multi charge transfer paths provided by graphene with the favorable arrangement of the material energy bands due to the presence of Sb 2 S 3 nanocrystals. The higher lowest unoccupied molecular orbital (LUMO) energy level of rGO–Sb 2 S 3 relative to PC 71 BM results in an increase of the open circuit voltage upon increasing the rGO–Sb 2 S 3 concentration, while the photocurrent and fill factor are enhanced due to the presence of more exciton dissociation interfaces and more efficient charge transport.