Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 7, Pages 7022-7029Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b20466
Keywords
organic photovoltaic devices; additive; diphenyl sulfide; vertical composition distribution; crystallinity
Funding
- National Natural Science Foundation of China [51463011]
- Natural Science Foundation of Gansu Province [18JR3RA108]
- Excellent Team of Scientific Research [201705]
- Foundation of A Hundred Youth Talents Training
- Youth Innovation Promotion Association CAS [2016194]
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To understand the vertical phase separation in the bulk junction active layer of organic photovoltaic devices is essential for controlling the charge transfer behavior and achieving effective charge collection. Here, diphenyl sulfide (DPS) was introduced as a novel additive into the PTB7-Th:PC71BM-based inverted polymer solar cells (PSCs), and the effect of additives on active blend films and photovoltaic characteristics was carefully studied. The results show that DPS could not only modulate the vertical composition distribution but also promote the ordered molecular packing of the photoactive layer, thus effectively improving exciton dissociation, charge transport, and collection, and thus exhibit an excellent power conversion efficiency of 9.7% with an improved fill factor (>70%) after using 3% DPS additive. The results show that the DPS solvent additive can effectively adjust the vertical phase distribution and crystallinity of blend films and improve the photovoltaic performance of the inverted organic photovoltaic devices.
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