Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
Lead-based organohalide perovskites are promising for thin film solar cell technologies as they can be solution processed or deposited by low-temperature evaporation techniques, their opto-electronic properties can be tuned, and they have been shown to be capable of power conversion efficiencies (PCEs) of >20%. A factor that has led to the improvement in perovskite solar cell efficiency has been the use of interfacial engineering to control the open-circuit voltage (Voc). In principle, perovskites can work efficiently in a very simple device architecture – a high quality absorbing layer sandwiched between work function modified anodes and cathodes. In an inverted architecture the holes are collected at the transparent conducting electrode. For inverted solar cells, the hole transport/interlayer material needs to modify the anode such that its work function is close to the ionisation potential of the organohalide perovskite junction to maximise Voc. Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) can act as an anode work function modifier and is a sufficiently hydrophilic hole transport material to enable the deposition of good quality perovskite films. However, PEDOT:PSS has a relatively low work function, which limits the open-circuit Voc. In this presentation, we will discuss two different methods to modify the work function of the ITO anode to increase the Voc as well as providing a surface energy suitable for depositing a good quality perovskite film. Using these methods Vocs > 1 V and and PCEs of up to 16.5% can achieved for simple solution processed perovskite cells.
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