The Investigation of Electrode Buffer Layers for Perovskite Solar Cells

• Main Authors: HUANG, CHIEN-WU, 黃千娪
• Other Authors: HUANG, CHIEN-JUNG
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/vshf8r

碩士 === 國立高雄大學 === 應用物理學系碩士班 === 105 === In this study, we discussed the electrode buffer layers for perovskite solar cells (PSCs). The effect of conventional PSCs with different amount and various spin-coating speeds of titanium dioxide (TiO2) as an electron transport layer was studied. The structure of device is fluorine doped tin oxide (FTO) / titanium dioxide (TiO2) / CH3NH3PbI3 (Perovskite) / 2,2',7,7'-Tetrakis [N, N-di(4-methoxyphenyl) amino]-9,9'-spirobifluorene (Spiro-OMeTAD) / silver (Ag, 100nm). The spin-coating speed of TiO2 in device is varied in a range for each 1000 rpm from 1000~3000 rpm to get the optimal value for the better performance. The power conversion efficiency (PCE) of each device was 9.93%, 7.40% and 1.06 %, respectively. The device by using 1000 rpm TiO2 has a better PCE than that of others, which is attributed to the better morphology of films, leading to higher short current density and lower series resistance. Besides, the effect of inverted PSCs with treatment for heating and stirring of the poly (3,4-ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT: PSS) as a hole transport layer in 50/100 nm thickness of the electrode layer was studied. The structure of device is indium tin oxide (ITO) / poly (3,4-ethylenedioxythiophene): poly (styrenesulfonate) (PEDOT: PSS) / CH3NH3PbI3 (Perovskite) / C60 (20nm) /BCP (10nm) / silver (Ag, 50/100nm). The volume of heated and stirred PEDOT: PSS in device is varied in 1700, 1500, 1300μL to get the optimal value for the better performance. The best power conversion efficiency (PCE) of device was 11.0% in 1500μL of PEDOT: PSS and deposition of 100nm silver, which is attributed to the optimized morphology of films and optimized viscosity of solution with the proper moisture, leading to higher short current density and lower series resistance. In addition, the open-circuit voltage is improved and enhanced to stable value by this treatment of PEDOT: PSS.