Abstract
A high VOC of 1V is achieved in the bulk heterojunction solar cell using the solution-processed small molecule donor p-DTS(FBTTh2)2 and indene-C60 bis-adduct acceptor.
Highlights
The open-circuit voltage (VOC) is one of the gures of merit determining the power conversion efficiency (PCE) of solar cells
We present the photovoltaic performance of pDTS(FBTTh2)2:indene-C60 bis-adduct (ICBA) blends prepared under various processing conditions
The photovoltaic parameters of the pDTS(FBTTh2)2:ICBA solar cells processed with various contents of DIO are listed in Table 1 and their J–V characteristics under AM 1.5G irradiation at 100 mW cmÀ2 are shown in Fig. S1, Electronic supplementary information (ESI).† The results demonstrate that the device processed without any additive exhibits a PCE of only 3.01% with a short-circuit current density (JSC) of 7.42 mA cmÀ2, a VOC of 1.017 V and a FF
Summary
Model,[5,6,7] Fermi level pinning between the metal electrode and the fullerene reduction potential,[8] the surface dipoles at the interfaces,[9,10] the formation of ground-state charge-transfer complexes between the acceptor and donor material,[11] and shunts in the photoactive layer causing leakage currents.[12] it appears that the VOC mainly depends on the energy offset between the highest occupied molecular orbital (HOMO) of the donor and the lowest unoccupied molecular orbital (LUMO) of the acceptor.[8,13] Based on this rather simple and empiric design rule, donor materials with deep HOMO levels have been designed to increase the VOC of BHJ organic solar cells. Recombination, plus trap-assisted recombination of free charges are the main reasons for the low FF
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