title: Improved Work Function of Poly(3,4-ethylenedioxythiophene): Poly(styrenesulfonic acid) and its Effect on Hybrid Silicon/Organic Heterojunction Solar Cells.
abstract: Hybrid silicon/organic solar cells have been recently extensively investigated due to their simple structure and low-cost fabrication process. However, the efficiency of the solar cells is greatly limited by the barrier height as well as the carrier recombination at the silicon/organic interface. In this work, hydrochloroplatinic acid (H2PtCl6) is employed into the poly(3,4-ethlenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) solution, and the work function (WF) of the PEDOT:PSS layer has been successfully improved. Based on the Pt-modified PEDOT:PSS layer, the efficiency of the silicon/PEDOT:PSS cell can be increased to 11.46%, corresponding to ~20% enhancement to the one without platinum (Pt) modification. Theoretical and experimental results show that, when increasing the WF of the PEDO:PSS layer, the barrier height between the silicon/PEDOT:PSS interface can be effectively enhanced. Meanwhile, the carrier recombination at the interface is significantly reduced. These results can contribute to better understanding of the interfacial mechanism of silicon/PEDOT:PSS interface, and further improving the device performance of silicon/organic solar cells.
authors.affiliation: Institute of Polymer Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang, Jiangsu Province, 212013, People's Republic of China.
authors.forename: Xiaojuan
authors.initials: X
authors.lastname: Shen
authors.affiliation: Institute of Polymer Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang, Jiangsu Province, 212013, People's Republic of China.
authors.forename: Ling
authors.initials: L
authors.lastname: Chen
authors.affiliation: Institute of Polymer Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang, Jiangsu Province, 212013, People's Republic of China.
authors.forename: Jianmei
authors.initials: J
authors.lastname: Pan
authors.affiliation: Institute of Polymer Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang, Jiangsu Province, 212013, People's Republic of China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Hu
authors.affiliation: Institute of Polymer Materials, School of Materials Science & Engineering, Jiangsu University, Zhenjiang, Jiangsu Province, 212013, People's Republic of China. lsjchem@ujs.edu.cn.
authors.forename: Songjun
authors.initials: S
authors.lastname: Li
authors.affiliation: College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, People's Republic of China. jzhao@suda.edu.cn.
authors.forename: Jie
authors.initials: J
authors.lastname: Zhao
keywords: Carrier recombination; Crystalline silicon; Heterojunction solar cells; PEDOT:PSS; Work function