In:
Journal of Nanoscience and Nanotechnology, American Scientific Publishers, Vol. 21, No. 11 ( 2021-11-01), p. 5749-5755
Abstract:
As a fullerene derivative, IC 70 BA is widely used in the ternary organic solar cells (TOSCs) to increase the open circuit voltage (V oc ) of the devices. Unfortunately, most of the literature shows that IC 70 BA will lead to a reduction in the short-circuit
current density (J sc ) and fill factor (FF). In this work, IC 70 BA is added to the PTB7:PC 70 BM binary system to form the ternary system, which is composed of one donor and two fullerene acceptors. Surprisingly, the addition of IC 70 BA does not immediately
lead to a decrease in J sc and FF. In fact, the appropriate weight ratio of IC 70 BA in fullerenes can simultaneously increase the V oc , J sc , and FF of the TOSCs. The synergistic optimization of the surface and bulk morphology of the ternary active layer
suppresses the attenuation of J sc and FF. The smooth surface and suitable phase separation size effectively guarantee the separation, transport and extraction of the charge. Moreover, the addition of IC 70 BA can significantly improve the hole transport capacity of the
active layer, and the optimal hole mobility is 5.13 – 10”4 cm 2 V –1 S –1 . Finally, the TOSCs with 10% weight ratio of IC 70 BA gives the optimal PCE of 9.24% and ideality factor of 2.3.
Type of Medium:
Online Resource
ISSN:
1533-4880
DOI:
10.1166/jnn.2021.19493
Language:
English
Publisher:
American Scientific Publishers
Publication Date:
2021
SSG:
11
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