Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
Increase in efficiency of polymer bulk heterojunction solar cells can be achieved by enhancing the spectral coverage of solar light absorption. In this work, we have attempted to implement the concept of Förster Resonance Energy Transfer (FRET) by adding BDT-DPP oligomer as third component to the binary bulk heterojunction solar cell of P3HT : PC71BM. The oligomer absorbs from visible to near infra-red region enhancing the light absorption of the ternary blend. The cascading of energy levels of the three components enables better charge extraction and FRET between the two donor moieties i.e. P3HT and BDT-DPP opens a new pathway for exciton dissociation which in turn improves the performance of solar cell. The Förster distance between P3HT and the oligomer being around 1.8nm, calculated from ground state PL studies, enables efficient energy transfer between them. The ternary solar cell resulted high power conversion efficiency of 4.1% which is around 30% higher than the reference binary solar cell of P3HT : PC71BM. The morphology of the active layer after addition of the third donor component became smoother which is evident from AFM studies. The contribution of the third component which helped in long range absorption was verified from the EQE spectra of the optimized blend ratio. This work demonstrates that careful choice of third component in ternary blend will be very useful in designing high performance polymer photovoltaic cells for future applications.
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