Abstract
Si/PEDOT: PSS solar cell is an important alternative for photovoltaic device due to its anticipated high theoretical efficiency and simple manufacturing process. In this study, processing silicon substrate with diluted NaOH aqueous solution was found to be an effective method for improving device performance, one that notably improves junction quality and light trapping ability. When immersed in diluted NaOH aqueous solution, the junction quality was improved according to the enlarged fill factor, reduced series resistance, and enhanced minor carrier lifetime. The diluted NaOH aqueous solution immersion etched the silicon surface and helped with the enhancement of light trapping ability, further improving the short-circuit current density. Although diluted NaOH aqueous solution immersion for bare silicon could improve the performance of devices, proper immersion time was needed. The influence of immersion time on device performances was investigated. The photovoltaic conversion efficiency easily increased from 10.01% to 12.05% when silicon substrate was immersed in diluted NaOH aqueous for 15 min. This study contributes to providing efficient and convenient methods for preparing high performance Si/PEDOT: PSS solar cells.
Highlights
Solar energy is the inevitable choice for addressing problems of energy shortage and environmental pollution
The results indicate that properly diluted NaOH aqueous solution processing helps to enhance performance
The Si substrate was immersed in diluted NaOH aqueous solution for 5, 15, 30, 45, and 60 min, separately
Summary
Solar energy is the inevitable choice for addressing problems of energy shortage and environmental pollution. The PCE of the Si/PEDOT: PSS solar cell has been improved 17.4% since its inception [2]; considerable room for further improvement still exists [3,4]. One of the essential problems that restricted the further improvement of PCE was the poor interface contact between Si and PEDOT: PSS film [5], which affected the junction quality of the. Si/PEDOT: PSS solar cell and further influenced device performance. To obtain excellent interface contact, the universal approach was applied to improve the wettability of PEDOT: PSS aqueous solution on Si prior to the spin-coating [6]. Incorporating a surfactant into the PEDOT: PSS aqueous solution is a simple method, and it helped to improve the PCE of the
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