Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV23)
Publication date: 30th March 2023
The remarkable success of non-fullerene acceptors in improving power conversion efficiencies of organic photovoltaics compared to earlier fullerene-based acceptors [1] has renewed interest in the details of the photovoltaic mechanism, and differences between the two types of acceptors. Since charge-transfer states, separated charges and triplet states involved in the photovoltaic mechanism are all paramagnetic, they can be characterised by electron spin resonance (ESR) spectroscopy.
By using the spins as probes, ESR spectroscopy can provide complementary information to more widely used optical characterisation techniques. In particular, the formation mechanism of photoinduced paramagnetic states is encoded in the observed spin polarisation of ESR spectra, a result of non-equilibrium population distributions. Based on the spin polarisation, ESR can distinguish between singlet- and triplet-born charge-transfer states, as well as between intersystem crossing and geminate recombination triplets.
We are using continuous-wave and transient EPR to investigate both fullerene- and non-fullerene-based blends by detecting and characterising paramagnetic states generated following photoexcitation and to examine the evolution of the spin states with time and identify differences in spin dynamics between the two types of blends.
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International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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