Double-side operable perovskite photodetector using Cu/Cu2O as a hole transport layer

In this study, a perovskite is integrated with an ultra-thin Cu/Cu2O (CCO) composite film, a transparent material with high mobility, to achieve a double-side and low-voltage operable photodetector. Compared to photodetectors that utilize metal electrode with perovskite, the use of CCO significantly enhances the photocurrent (from nA up to mA). It acts as a large-scale hole transport layer. The photodetector exhibits high responsivities of 6.79 AW(-1) [illuminated via the fluorine-doped tin oxide (FTO) side] and 10.23 AW(-1) (illuminated via CCO side). The detectivities obtained at both illuminated sides are as high as over 10(11) Jones. Additionally, the Cu/Cu2O-covercd perovskite effectively prevents the reaction of perovskite in the interface. This work reveals that the perovskite/CCO heterojunction photodetector can be considered a promising candidate for applications in bifacial-illuminated and flexible/wearable optoelectronic technologies. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement