Publication date: 11th March 2026
Historically, inorganic solar cells are designed with a p-n junction, which improves efficient charge collection and separation. However, this concept has not been tested on organic semiconductor materials and remains largely unexplored. With the intrinsic charge-generating property of Y6 and its propensity for both p- and n-doping, it is possible to design a first p-n junction of single-component organic solar cells. Moreover, the p-n junction in organic solar cells have a potential to enhance the charge generation ability of Y6, improving the exciton separation. In this study the p-doping with TrTPFB and n-doping with N-DMBI of Y6 are utilised for the fabrication of the p-n junction. The fabrication of the p-n junction involves a combination of spin-coating and PDMS-transfer methods for the bilayer formation. The results demonstrate the improvement of charge generation leading to enhanced short-circuit current and power conversion efficiency in p-n junction architecture devices. Among all studied variations of the bilayers, the p-n junction with p-doped Y6 as a bottom layer and n-doped Y6 as a top layer demonstrates the best performance. These results reveal that it is possible to form a p-n junction for improving the characteristics of single-component solar cells, providing an avenue to further improvement of the next-generation single-component organic solar cells.
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