Effect of Organic Solar Cells by Inserting Pentacene Layer

Tuesday, 7 October 2014
Expo Center, 1st Floor, Center and Right Foyers (Moon Palace Resort)
P. H. Huang (National University of Kaohsiung), K. L. Chen (Fortune Institute of Technology), N. L. Shih (National University of Kaohsiung), T. H. Meen (National Formosa University), and C. J. Huang (National University of Kaohsiung)
This work have demonstrated the effect of small molecule organic solar cells based on a planer heterojunction of phthalocyanine (CuPc) and fullerene (C60) by inserting pentacene layer between MoO3 and CuPc. The performance of device with structure indium tin oxide (ITO)/MoO3 (5 nm)/pentacene (0~10 nm)/CuPc (20 nm)/C60 (30 nm)/ 2, 9-dimethyl-4, 7-diphenyl-1, 10-phenanthroline BCP (10 nm)/aluminum (Al, 100 nm) was enhanced by inserting optimized thickness pentacene layer. The power conversion efficiency (PCE) of device compared to reference information was improved from 0.564% to 0.782%. This achievement of efficiency is not only attributed to the properties of pentacene, which is more suitable in hole transporting ability of high carrier mobility (~1.5 cm2/Vs) and field-effect mobility (~3.0 cm2/Vs), but also the thin MoO3 layer blocks the transfer of electrons into anode and therefore reduces electron leakage current, which leads to the increase of open circuit voltage (VOC), short circuit current (JSC), and PCE. As a result, the pentacene interlayer is also served as a hole transport layer to improve transport of charge carriers and reduce dissociation of excitons.