Charge transfer modeling in monolayer circular graphene quantum dots–ZnO nanowires system for application in photovoltaic devices

Abstract

We investigate electron transport between circular graphene quantum dots (CGQDs) and ZnO nanowires (ZnO NWs). This structure can be used as donor and acceptor in hybrid solar cells. We consider circular quantum dots (QDs) and use analytical calculation in order to estimate wavefunctions of GQD and ZnO NWs. After calculating the wavefunctions overlap, we use Marcus relation in order to calculate electron transfer rate. Also, we calculate this transfer rate for CdSe QDs–ZnO NWs system. Results from analytical calculation show that the transfer rate is limited to 10[Formula: see text] s[Formula: see text]. This result is in agreement with experimental results which are reported earlier. Such systems could be suitable for solar cells.

Nature of photoexcited states in ZnO-embedded graphene quantum dots

“…The pronounced charge separation at a Semiconductor Materials Division, Department of Physics, Chemistry and Biology-the GQDs/ZnO interface also provides good prerequisites of using this hybrid material in perovskite-, dye sensitized-, quantumdot-sensitized-and inverted polymer solar cells. [30][31][32][33][34][35][36][37][38][39][40][41][42][43] ZnOgraphene quantum dots system is promising for designing optoelectronic devices (namely light-emitting diodes, LEDs), [44][45][46][47][48][49] playing a role of either electron transport layer or active emissive component. Particularly, a brightness of 798 cd m À2 was achieved for white LEDs based on ZnO cores wrapped in a shell of GQDs.…”

Synthesis of luminescent graphene quantum dots from biomass waste materials for energy‐related applications—An overview

“…Solar cells are becoming an essential energy source for society as the demand for greener approaches for production of electricity is on the rise. Various types of solar cells include thin film solar cells, traditional silicon solar cells, 120 polymer solar cells, 24,118,119 CdTe solar cells, [121][122][123][124] and other novel solar cells 125,126 (shown in Figure 6A). GQDs can be used to fabricate solar cells due to their strong fluorescence, intense absorption in the UV range, and easy functionalization.…”