title: Enhanced performance using an SU-8 dielectric interlayer in a bulk heterojunction organic solar cell.
abstract: The effect of inserting an SU-8 dielectric interlayer into inverted bulk heterojunction (BHJ) organic solar cells (OSCs) was studied. Insertion of an ultrathin layer of SU-8 between the zinc oxide (ZnO) electron transport layer and the photoactive layer resulted in a smoother interface and a 14% enhancement in power conversion efficiency. The properties of devices with and without an SU-8 interlayer were investigated using transient photovoltage (TPV) and double injection (DoI) techniques, and it was found that devices with SU-8 show longer carrier lifetimes and greater mobility-lifetime (μ-τ) products than those without. Devices with SU-8 were also found to have improved stability. The results indicate that the insertion of an SU-8 interlayer reduces the recombination rate for photogenerated carriers without affecting the charge transport properties, improving overall performance and stability.
authors: Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR) , 3 Research Link, 117602, Singapore.
authors: Christina
authors: C
authors: Pang
authors: Vijila
authors: V
authors: Chellappan
authors: Jong Hyuk
authors: JH
authors: Yim
authors: Mein Jin
authors: MJ
authors: Tan
authors: Glen Tai Wei
authors: GT
authors: Goh
authors: Soonil
authors: S
authors: Lee
authors: Jie
authors: J
authors: Zhang
authors: John
authors: J
authors: de Mello
keywords: ambipolar mobility; carrier lifetime; charge transport; device stability; electron transport layer; insulating dielectric; interface; organic solar cells