Surface modification of Heterojunction with Intrinsic Thin layer solar cell's electrode with organosilane

• Main Authors: CHEN, CHIH-HUNG, 陳智宏
• Other Authors: CHEN, BING-MAU
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/3ara54

碩士 === 明新科技大學 === 光電系統工程系碩士班 === 107 === 　The purpose of in this dissertation is to achieve a simple and low cost method for surface modifying solar cell electrode. Self-Assembled Multilayer (SAMT) films were prepared by using 3-aminopropyltrimethoxysilane (APTMS) to modify indium-tin oxide (ITO) surface of the (Heterojunction with Intrinsic Thin Film, HIT) solar cell device. Self-Assembled Multilayer (SAMT) films with different functional groups were deposited on the ITO surface. The influence of the APTMS thin films on the morphology, optical and electrical properties of the ITO electrode were investigated. 　　Initially, the SAMT processing parameters were studied by immersing ITO glasses into APTMS aqueous solution with various concentrations and dipping times. The APTMS thin film morphology were observed with SEM/EDS. The elemental composition further comfirmed the existence of the APTMS thin films on the ITO glass. UV-Vis spectrometers, fluorescent spectrometers, and Hall measurements were carried out to measure the changes of the surface defects, electron mobilities and electron concentrations of the ITO after APTMS surface modification. By using Kelvin probe, SPM (Scanning Probe Microscopy), and AC impedance measurement, the electrical properties, surface work function, surface potential and energy band bending of the ITO glass were studied. 　　The experimental results showed that by immersing ITO glass in 10 wt.% APTMS aqueous solution for 15 minutes, the electron mobility of the ITO increased by 6.36%, indicating that APTMS contributed to the improvement of ITO conductivity. A decrease in the ITO emission intensity measured by a fluorescence spectrometer demonstrated reduction of surface defects on ITO surface. 　　Finally, the effect of the APTMS thin film on the performance of the HIT solar cell were conducted. The measurement of current-voltage (I-V) characteristic of the HIT solar cell showed the leakage current was reduced by 29%, and the power generation efficiency was increased by 0.5% after surface treatment with 10 wt.% APTMS aqueous solution for 15 minutes. The results reveal that adsorption of the APTMS film on HIT solar cell indeed has an effect on electrode passivation.