Structuring poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) towards enhancing hole collection efficiency.

Unlabelled: To date, organic photovoltaic devices (OPVs) have obtained relatively low power conversion efficiency, mostly because of the low charge carrier mobility of the polymers to be used. This limits the optimal film thickness for efficient absorption of the solar spectrum. The capability of efficient charge carrier collections is a main factor for utilizing thick OPVs, consequently enhancing the power conversion efficiency. In this report, we demonstrate a facile approach for enhancing the hole carrier collection by possibly shortening the hole collection path via structuring poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (

Pedot: PSS), which is widely used as a hole collecting intermediate layer in OPVs. For structuring the

Pedot: PSS, the nanosphere lithographic method was used. Furthermore, the effects of the structuring of

Pedot: PSS on optical properties were also investigated.