Abstract
Using the optical transfer matrix method, we optimized the layered structure of a conventional and an inverted BHJ OSC with the active layer made of blended PTB7-Th:PNDI-T10 by maximizing the optical absorption and, hence, the JSC. The maximum JSC thus obtained from the optimised structure of the inverted OSC was 139 Am−2 and that of the conventional OSC was 135 Am−2. Simulation of the electric field distribution in both inverted and conventional OSCs showed that the formation of a single CIP was obtained in the active layer of thickness 105 nm in both OSCs. As the light incidents from the ITO side, it was found that excitons were generated more closely to ITO electrode, which favors the efficient charge transport and collection at the opposite electrodes in the inverted OSC, which produces higher JSC.
Highlights
Increasing demand for clean energy and utilization of environmentally sustainable means for generating electricity are fueling the rapid development and commercialization of a broad range of renewable energy technologies [1,2,3,4]
The photovoltaic research is currently focused on the development of efficient organic solar cells (OSCs) as an alternative to the well-established inorganic counterparts largely based on crystalline silicon (c-Si)
This is evidenced by the steady increase in the power conversion efficiency (PCE) of organic solar cells [6]
Summary
Increasing demand for clean energy and utilization of environmentally sustainable means for generating electricity are fueling the rapid development and commercialization of a broad range of renewable energy technologies [1,2,3,4]. The power conversion efficiency (PCE), better than a single-layer structure, is still very low in a bilayer To address this problem, the bulk heterojunction (BHJ) structure was invented [17], where the donor and acceptor materials are blended together within the active layer, which results in many D–A interfaces within the active layer and, offers almost 100% exciton dissociation [18]. To investigate the light absorption, exciton generation, and recombination rates in conventional and inverted BHJ polymer: fullerene OSCs and found that the inverted structure requires a thinner active layer than the conventional structure to absorb the same amount of incident solar radiation.
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