Optimizing Device Structure of PTB7-Th:PNDI-T10 Bulk Heterojunction Polymer Solar Cells by Enhancing Optical Absorption

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.

The role of domain size and weight ratio of fullerene and non-fullerene acceptors on performance of PM6:Y6: PCBM ternary solar cell

“…Once it reaches to the Donor/Acceptor1 (or Donor/Acceptor2) interfaces, the electron in the donor's LUMO moves to acceptor1's (or acceptor2's) LUMO, which located at lower energy. [22]. On the other hand, since the light enters from the anode, most absorption occurs near the anode.…”