Role of graphene-oxide and reduced-graphene-oxide on the performance of lead-free double perovskite solar cell

Abstract

Lead-free perovskite solar cells (PSCs) have sparked considerable interest in the optoelectronics research community and gained recognition in recent years due to their practical use in solar energy. The primary obstacles in producing PSCs are stability and toxicity due to the immersion of organic-cation and lead in perovskite material. This study presents an electrical simulation of a caesium–indium-based lead-free hybrid PSC using SCAPS-1D software. Spiro-MeOTAD is a typical hole transport material (HTM) used in PSC, although it has not always been suggested because of its high design cost and stability constraints. This study aims to evaluate the performance of lead-free double perovskite material as an absorber layer along with different hole transport materials (HTM). We discovered that the lead-free double perovskite combined with graphene-oxide (GO) and reduced graphene oxide (rGO) produces the best results. Furthermore, the light-harvesting layer and HTM layer has optimized via thickness, defects, doping concentration, and temperature. The improved PSC structure achieves power conversion efficiency (PCE) of more than 24%, and the results of the optimized PSC have compared to the results of the experimentally implemented PSC. This work also used C–V measurements on the optimized structure to determine the device contact potential and doping concentration. The optimized results suggest a feasible future route for creating lead-free PSC with high productivity and free from stability or toxicity issues.

Morphological, Photoluminescence, and Electrical Measurements of Rare-Earth Metal-Doped Cadmium Sulfide Thin Films

“…On the other hand, the unique electronic structures of rare-earth metal elements are responsible for their special properties, which make them useful in a wide range of optoelectronic fields, including photovoltaics. While the use of such rare metals in solar cell technology is still not common, there has been some research regarding the use of rare-earth metal-doped buffer layers to enhance solar cell performance. − The introduction of rare-earth metal ions at the CdS/CdTe interface can modify the band alignment and improve charge separation and transport. The schematic of the energy band alignment of deposited thin films in CdTe-based solar cells is illustrated in Figure .…”

Experimental and computational DFT, drift-diffusion studies of cobalt-based hybrid perovskite crystals as absorbers in perovskite solar cells

“…Subsequently, the PSC experienced a decline to 7.5% owing to an observed augmentation in the diffusion length of the device. 36 The efficiency increased up to 550 nm because the absorber layer could absorb most of the incident sunlight at that thickness. However, if the absorber layer was thicker than 550 nm, it started to reflect more light back out of the cell, which reduced the efficiency.…”