Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Solution-processable solar cells have the ability to be a low-cost, lightweight and flexible solar technology. The open-circuit voltage (VOC) is an important parameter for efficiency and is a balance between charge generation and recombination. Typically, solution processed solar cells, i.e. organic bulk heterojunctions (OPV), show large voltage losses compared to the maximum VOC in the Shockley-Queisser limit (>0.4 V), and that of conventional inorganic solar cells (<0.2 V).1 However, recent developments in non-fullerene acceptors (NFAs)2 for OPV and the vast amount of work into perovskite solar cells,3 has led to solution processed solar cells with VOC beyond 1V and energetic losses less than 0.4 V, crucially without significant loss in current.Through the use of a range of optoelectronic techniques including transient photovoltage (TPV), transient photocurrent (TPC) and charge extraction (CE), we study the charge carrier recombination kinetics and material energetics to understand the origin of the high VOC achievable in these organic and perovskite photovoltaic systems. Along with the successful reconstruction of the VOC over a wide range of light intensities, we conclude surface recombination at the contacts to be an important loss mechanism. Further voltage improvements could be possible if alternative contacts and interlayer materials can be sourced.
1. Yao, J. et al. Quantifying Losses in Open-Circuit Voltage in Solution-Processable Solar Cells. Physical Review Applied 4, 014020 (2015).
2. Nielsen, C. B., Holliday, S., Chen, H.-Y., Cryer, S. J. & McCulloch, I. Non-Fullerene Electron Acceptors for Use in Organic Solar Cells. Accounts of Chemical Research 48, 2803-2812.
3. Bi, D. et al. Efficient luminescent solar cells based on tailored mixed-cation perovskites. Science Advances 2, (2016).
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