This study was undertaken to investigate the effect of ultraviolet (UV) irradiation on poly(3-hexylthiophene-2,5-diyl):[6,6]-phenyl-C61-butyric acid methyl (P3HT:PCBM) solar cells before the thermal annealing of its active layer. Aggregation size of the active layer was observed to increase after UV irradiation, according to the transmission electron microscopy images. Characterization of X-ray diffraction and atomic force microscopy demonstrated that UV irradiation can improve the crystallinity of P3HT phase and optimize the roughness of the active layer. Simulation results indicated that UV irradiation of appropriate time can improve physics parameters of the devices. As a result, the maximum power conversion efficiency of the devices was increased from 3.5% to 4.5%.
Bibliographical noteFunding Information:
The authors would like to thank the financial support from the grant of the National Basic Research Program of China (973 Program) ( 2014CB648300 , 2015CB932203 ), the National Natural Science Foundation of China ( 61504066 , 91233117 , 51173081 , 61136003 , 61376023 ), the Natural Science Foundation of the Jiangsu Higher Education Institutions of China ( 15KJB430024 ), the Natural Science Foundation of Jiangsu Province, China ( BK20150838 , BM2012010 ), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) ( YX03001 ), the Program for Changjiang Scholars and Innovative Research Team in University ( IRT1148 ), the Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM) , the Synergetic Innovation Center for Organic Electronics and Information Displays , the National Basic Research Program of China (973 Program) ( 2012CB933301 ), and sponsored by Nanjing University of Telecommunications and Posts (NUPTSF) (Grant Nos. NY212034 , NY214089 , NY212002 , NY212010 ).
© 2015 Published by Elsevier B.V.
- Aggregation morphology
- Organic photovoltaic
- UV irradiation treatment