Organic Solar Cells with Highly Transparent Ternary Bulk-Heterojunctions
Andrii Mostovyi a, Hryhorii Parkhomenko a, Nora Schopp b, Mykhailo Solovan c, Viktor Brus a
a Department of Physics, School of Sciences and Humanities, Nazarbayev University, Astana 010000, Republic of Kazakhstan
b First Solar Inc., 28101 Cedar Park Blvd, Perrysburg, Ohio 43551, United States
c Faculty of Physics, Adam Mickiewicz University, Poznan 61-614, Poland
Poster, Andrii Mostovyi, 185
Publication date: 6th February 2024

Organic solar cells (OSCs) promise cost-effective and environmentally friendly conversion of solar energy into electrical power. Unlike traditional semiconductors and perovskites, organic semiconductors exhibit selective absorption across the electromagnetic spectrum. This unique characteristic enables precise selection of donor and acceptor components to optimize light transmission within specific spectral ranges. Additionally, organic semiconductors possess a substantial absorption coefficient of approximately 105 cm−1, ensuring efficient light absorption even within ultra-thin active layers, typically just a few hundred nanometers thick. These attributes distinguish organic semiconductors from their inorganic counterparts and position them as highly desirable candidates for semi-transparent organic solar cells (ST-OSCs).

In this study, we present ternary bulk-heterojunctions (BHJ) based OSCs featuring an outstanding average visible transmittance (AVT) of the active layer. The incorporation of PTAA, an organic material, into the PCE10:COTIC-4F system enhances photogeneration in the ultraviolet spectral range. Subsequently, replacing the COTIC-4F acceptor with SiOTIC-4F leads to an increase in open-circuit voltage, elevating the performance of opaque OSCs from 4.41% to 5.77%, while maintaining an excellent AVT of approximately 80% for the BHJ layer. A comprehensive analysis of the device physics of opaque OSCs with various donor:acceptor blends sheds light on the generation-recombination processes occurring across different blends.

In the final phase of the study, we fabricate semi-transparent OSCs (ST-OSCs) and offer insights into leveraging highly transparent BHJ layers in the realm of semi-transparent organic photovoltaics (ST-OPVs). This work presents a practical solution for ST-OSCs, achieving exceptional AVT of the BHJ layer, a critical factor for the future commercialization of ST-OPVs.

This work is supported by the Collaborative Research Program Grant of Nazarbayev University Grant No. 11022021CRP1505 and the Faculty-Development Competitive Research Program Grant of Nazarbayev University Grant No. 11022021FD2915.

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