Publication date: 15th February 2023
Light emission and detection are the two basic elements in optoelectronic communication systems. Generally, both functions have been demonstrated using the p-n diode structure which is used for wide range of optoelectronic applications. However, the processes of carrier injection and photocarrier collection have competing carrier dynamics, where in order to implement both functions, the direction of the applied electrical bias should be switched. In current work we demonstrate that the concept of mixed ionic-electronic conduction in halide-perovskites is beneficial in demonstrating the novel effect: light-emitting photodetection without switching applied electrical bias. The device consists of a lateral structure where CsPbBr3 microwire is connected to single-walled carbon nanotube (SWCNT) thin film electrodes. Both functionalities of light detection and light emission come from the modulation of an energetic barrier caused by the cooperative effect of mobile ions and the photogenerated charge carriers at the CsPbBr3/SWCNT interface. We additionally see the electroluminescence enhancement by optical light. Such dynamic and complex behaviour governed by mixed ionic-electronic conduction in halide-perovskites will be in demand in multifunctional optoelectronic devices searching for complex multifunctional materials.
A.A.M. acknowledges Priority 2030 Federal Academic Leadership Program and acknowledge Russian Science Foundation (Project Number 19-73-30023).
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