期刊
ENERGIES
卷 13, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/en13020450
关键词
organic solar cells; ternary blend; bulk heterojunction; cascade effect; charge transfer; additive; benzothiadiazole; small molecule
资金
- Erasmus Plus Capacity Building Project entitled Innovative Photonic Education in Nanotechnology-iPEN of the European Union [586165-EPP-1-2017-1-EL-EPPKA2-CBHE-JP]
A conjugated, ladder-type multi-fused ring 4,7-dithienbenzothiadiazole:thiophene derivative, named as compound 'T', was for the first time incorporated, within the PTB7:PC71BM photoactive layer for inverted ternary organic solar cells (TOSCs) realization. The effective energy level offset caused by compound T between the polymeric donor and fullerene acceptor materials, as well as its resulting potential as electron cascade material contribute to an enhanced exciton dissociation, electron transfer facilitator and thus improved overall photovoltaic performance. The engineering optimization of the inverted TOSC, ITO/PFN/PTB7:Compound T(5% v/v):PC71BM/MoO3/Al, resulted in an overall power conversion efficiency (PCE) of 8.34%, with a short-circuit current density (J(sc)) of 16.75 mA cm(-2), open-circuit voltage (V-oc) of 0.74 V and a fill factor (FF) of 68.1%, under AM1.5G illumination. This photovoltaic performance was improved by approximately 12% with respect to the control binary device.
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