การสังเคราะห์และการหาลักษณะเฉพาะของทินไดออกไซด์ควอนตัมดอทโดย วิธีอิเล็กโทรไลซิสที่ใช้แรงดันไฟฟ้าต่ำสำหรับการประยุกต์ใช้ในเซลล์แสงอาทิตย์ชนิดเพอรอฟสไกต์

Abstract

Tin dioxide Quantum dot (SnO2 QDs) can be applied as electron-transporting layer for efficiency enhancement of conventional perovskite solar cell (PSCs). Here, SnO2 QDs are synthesized by electrochemical process and investigated for the perovskite solar cell application. The electrochemical process is performed in distilled water and in citric acid (0.1 M) at applied voltage of 6V by using tin foil as electrodes. It is found that the obtained solutions for all conditions show clear color but a Tyndall effect can be observed when shining laser light in the solutions. The observed Tyndall effect indicates a light scattering of the fine particles dispersed in the solutions as a colloid. From TEM images, the diameter of colloid particles is 3.35±0.15 nm for water solution and 3.14±0.11 nm for citric acid solution suggesting quantum property. The hydrodynamic size of colloid from dynamic light scattering (DLS) technique is calculated to be 69.6±0.4 nm for water solution and 135.9±0.9 nm for citric acid solution. These SnO2 QDs are used in the conventional structure of perovskite solar cells. The photo conversion efficiency (PCE) of solar cells based on SnO2 QDs is 13.59% for water solution and 13.24% for citric acid solution compared to12.63% for the reference cell which is based on SnO2 nanoparticles. Therefore, SnO2 QDs can be successfully used for efficiency enhancement of PSCs.