Guo Li is a current postgraduate student in the School of Photovoltaic and Solar Energy Engineering (SPREE) in UNSW. In 2018, He received his bachelor’s degree in the Faculty of Material and Physics from Southwest University, China. During his college study, he was also involved in a series of first-principles Density Functional Theory (DFT) calculations to study the electronic properties and charge transfer mechanism of an Organic Solar Cell (OSC) donor material, Boron subphthalocyanine (BsubPC). And now with the supervision of Prof Bram Hoex, his research interest is the pinhole effects on the advanced carrier selective contact, POLO junction. To further improve the efficiency of silicon solar cell, POLO junction is able to impede the transportation of minority carriers while allows the majority carriers to go through. Therefore, it is an ideal contact to hind the recombination in the solar cells and hence, push the efficiency to its upper limit.