Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
DOI: https://doi.org/10.29363/nanoge.hopv.2023.040
Publication date: 30th March 2023
Ternary organic solar cells (TOSCs) employing two donors and an acceptor is a low-cost approach to enhance device performance without the need for complex tandem cells. Organic dyes are promising for incorporation into organic solar cells as the third component as they have been used as co-sensitisers in dye-sensitised solar cells (DSSCs) due to their excellent molar absorption coefficient and high photostability. [1][2]
In this study, an organic dye Rhodamine B (RhB) has been added to a binary blend of PTB7-Th:PC70BM, fabricated with an inverted device architecture under ambient conditions. RhB exhibits a complementary absorption range to the binary blend in the active layer; thus, the ternary blend of RhB:PTB7-Th:PC70BM can maximize photon harvesting across the whole visible light region. This has contributed to enhanced short-circuit current (Jsc)in the ternary blend device. The different weight content of RhB has been optimised to achieve a power conversion efficiency (PCE) of 7.4% which is 27% higher than in the binary blend without RhB. The Jsc and fill factor (FF) have improved by 12.9% and 10.9% respectively, while the open-circuit voltage (Voc) remains consistent with the addition of RhB. Despite the higher Jsc, the FF still increase mainly from a significant decrease in series resistance, likely from improved morphology in the ternary blend that enabled better charge separation and transport in the ternary blend active layer. This is corroborated by the higher values of incident photon-to-current conversion efficiency (IPCE) across 530 - 750 nm, despite RhB mainly absorbing around 530 - 580nm. Further insight into charge transport and recombination in the ternary blend has been studied with J-V curves under different light intensities as well as electrochemical impedance spectroscopy (EIS). Based on steady-state photoluminescence (PL) and transient absorption spectroscopy (TAS) measurements, Förster resonance energy transfer (FRET) has been observed to take place from RhB to PTB7-Th, followed by charge dissociation at PTB7-Th/PC70BM interface. Furthermore, the operational stability of the ternary blend device is significantly enhanced with the addition of RhB. A molecular fluorescence probe for singlet oxygen has also been employed to investigate photochemical degradation in the binary and ternary blend films. Overall, adding RhB as the third component in TOSCs has boosted device performance and lifetime.
The authors acknowledge financial support from Universiti Brunei Darussalam through grant numbers UBD/RSCH/URC/NIG/8.0/2021/001 and UBD/RSCH/URC/NIG/8.0/2021/002 under the Optoelectronic Device Research Group.
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