High efficiency performance of eco-friendly C2N/FASnI3 double-absorber solar cell probed by numerical analysis

In this paper, the double-absorber solar cell based on C2N and FASnI3 as echo-friendly absorber materials has been modelled and simulated. Numerical simulations were performed by utilizing the one-dimensional solar cell capacitance simulator (SCAPS-1D). The study shows that optimizing the parameters of the solar cell layers is vital to achieving high device performance. Decreasing the thickness of the buffer layer (IGZO) and C2N to 10 nm and increasing the thickness of FASnI3 to 1000 nm paved the device toward high performance. Increasing the electron affinity of FASnI3 showed a positive impact on the device performance, reflecting its rule as a key parameter in bands alignement of the absorber layer. In the electron affinity range, 4.3 eV–4.6 eV, the power conversion efficiency of 25.32% is obtained. This value is higher than that of a single absorber layer solar cell using the same absorber materials quoted in previous studies. Additionally, the heavy doping density of both absorber layers deteriorates the device performance. The optimal performance is achieved with a doping density of less than 1×1018 cm−3 in C2N and 1×1017 cm−3 in FASnI3. Furthermore, the influence of the back contact work function is explored by using different metals as a back contact. The results show that high metal work function is essential for enhancing solar cell performance, and nickel is the most promising material for the solar cell industry. Finally, the simulations show that the device operates optimally at 300 K, and increasing the temperature opposes the solar cell performance. •Numerical Analysis of high-efficiency toxic-free C2N/FASnI3 double-absorber solar cell.•Significant enhancement in the solar cell performance by implementing double-absorber layer in the solar cell structure.•A High efficiency record of 25.32% in C2N/FASnI3 double-absorber solar cell is achieved.•Importance of the conduction bands alignment on the solar cell performance.•Monitoring the photovoltaic device performance through the back contact work function.