title: Analysis of annealing process on P3HT:PCBM-based polymer solar cells using optical and impedance spectroscopy.
abstract: Thermal annealing is a well-known process for polymer solar cells because it improves the device characteristics. Especially, the carrier mobility and the light absorption of P3HT:PCBM are significantly improved after the annealing process. Here, we examined the changes in the morphology of P3HT:PCBM film according to the annealing temperature to find the changes during the thermal annealing process by measuring the optical absorption and X-ray diffraction. We also investigated the effect of two different annealing process (pre- and post-annealing) on the device performance of the standard polymer solar cells consisting of ITO/MoO3 (10 nm)/P3HT:PCBM (150 nm)/LiF (0.5 nm)/Al (100 nm) by measuring current density-voltage and impedance characteristics. From the results, we found that the improvement in terms of the power conversion efficiency of the post-annealed device originated from the decrease of injection resistance between P3HT:PCBM layer and Al electrodes.
authors.affiliation: Department of Electrical and Computer Engineering, Inter-University Semiconductor Research Center, Seoul National University, Seoul 151-744, Republic of Korea.
authors.forename: Jun Young
authors.initials: JY
authors.lastname: Kim
authors.forename: Seunguk
authors.initials: S
authors.lastname: Noh
authors.forename: Jeonghun
authors.initials: J
authors.lastname: Kwak
authors.forename: Changhee
authors.initials: C
authors.lastname: Lee
mesh_terms: D058266:Dielectric Spectroscopy / Q000379:methods*; D011211:Electric Power Supplies; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D037741:Fullerenes / Q000737:chemistry*; D006244:Hardness; D006358:Hot Temperature; D016566:Organoselenium Compounds / Q000737:chemistry*; D012993:Solar Energy; D014961:X-Ray Diffraction
chemical_list: C551883:1-(3-methoxycarbonyl)propyl-1-phenyl-(6,6)C61; D037741:Fullerenes; D016566:Organoselenium Compounds; C526212:poly(3-hexyl)selenophene