Abstract
This work demonstrates the high performance graphene oxide (GO)/PEDOT:PSS doubled decked hole transport layer (HTL) in the PCDTBT:PC71BM based bulk heterojunction organic photovoltaic device. The devices were tested on merits of their power conversion efficiency (PCE), reproducibility, stability and further compared with the devices with individual GO or PEDOT:PSS HTLs. Solar cells employing GO/PEDOT:PSS HTL yielded a PCE of 4.28% as compared to either of individual GO or PEDOT:PSS HTLs where they demonstrated PCEs of 2.77 and 3.57%, respectively. In case of single GO HTL, an inhomogeneous coating of ITO caused the poor performance whereas PEDOT:PSS is known to be hygroscopic and acidic which upon direct contact with ITO reduced the device performance. The improvement in the photovoltaic performance is mainly ascribed to the increased charge carriers mobility, short circuit current, open circuit voltage, fill factor, and decreased series resistance. The well matched work function of GO and PEDOT:PSS is likely to facilitate the charge transportation and an overall reduction in the series resistance. Moreover, GO could effectively block the electrons due to its large band-gap of ~3.6 eV, leading to an increased shunt resistance. In addition, we also observed the improvement in the reproducibility and stability.
Highlights
PEDOT:PSS by introducing inorganic semiconductors such as V2O512,13, NiO14, WO315 or MoO316, among others, to address the reliability issues related to PEDOT:PSS
Findings suggest the enhanced efficiency of PCDTBT:Phenyl C71 butyric acid methyl ester (PC71BM) based Organic photovoltaic devices (OPVs), using a solution processed graphene oxide (GO)/PEDOT:PSS double decked layer as an hole transport layer (HTL)
The bulk heterojunction (BHJ) OPVs were fabricated with single GO, PEDOT:PSS and double decked GO/ PEDOT:PSS as HTLs
Summary
PEDOT:PSS by introducing inorganic semiconductors such as V2O512,13, NiO14, WO315 or MoO316, among others, to address the reliability issues related to PEDOT:PSS Deposition of these oxide materials normally involves intensive costs related to high vacuum techniques which are incompatible with the large scale R2R OPV production. In this context, solution processed aqueous dispersion of graphene oxide (GO) has been recently used by several groups as an HTL material for ITO anode[17,18,19]. GO in combination with PEDOT:PSS as an HTL exhibited a high efficiency and stability as compared to either of single PEDOT:PSS or GO HTLs. This study investigated the electrical, optical, chemical and morphological properties and their effects on the performance of the OPVs
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