Highly efficient inverted polymer solar cells with reduced graphene-oxide-zinc-oxide nanocomposites buffer layer

Woo Lee, Hyun; Young Oh, Jin; Il Lee, Tae; Soon Jang, Woo; Bum Yoo, Young; Sang Chae, Soo; Ho Park, Jee; Min Myoung, Jae; Moon Song, Kie; Koo Baik, Hong
May 2013
Applied Physics Letters;5/13/2013, Vol. 102 Issue 19, p193903
Academic Journal
In this study, we reported a 36% improvement in the performance of inverted solar cells as a result of increased short-circuit current (JSC) obtained using a composition of zinc oxide (ZnO) and reduced graphene oxide (RGO) as an n-type buffer layer. RGO-ZnO nanocomposites show higher electron conductivity than intrinsic ZnO; moreover, they show reduced contact resistance at the interface between the active layer and n-type buffer layer. These factors prevent carrier loss resulting from defects and recombinations in the device, thereby significantly increasing the JSC value for the device. Thus, an efficiency of 4.15% was achieved for inverted solar cells with a controlled RGO-ZnO nanocomposites layer.


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