Open-Air Vapor-Assisted Solution Process Perovskite Solar Cell and Graphene Anode Conventional Organic Solar Cell
Date Issued
2015
Date
2015
Author(s)
You, Xue-Qian
Abstract
In this study, performance improvement of Perovskite solar cells using two-step vapor-assisted solution process(VASP) has been achieved. Through experimental optimization, solar cell with optimal structure have been carried out and the mechanisms behind have been discussed in detail. Via scanning electron microscopy(SEM), the thickness profile and the morphological variation for Perovskite film obtained in different ways were investigated systematically. Next, the influence of post-annealing on device performance was verified by X-ray diffraction(XRD), suggesting that appropriate post treatment is crucial to the quality of active layer as well as the resulting performance. This is in addition to the study of passivation effect developed by PCBM([6,6]-phenyl-C61-butyric acid methyl ester) electron transport layer and also the Ca buffer incorporation, resulting in further improvement with decent fill factor for proposed devices. Based on these findings, the power conversion efficiency for Perovskite solar cells with an optimal device configuration has achieved over 11%. Further, a buffer material, HBC-6ImBr(Hexa-peri-hexabenzocoronene-6ImBr), was employed to enable hydrophilic properties for the hydrophobic graphene, allowing graphene bottom anode for conventional organic photovoltaics(OPV). With the aid of HBC-6ImBr, the aqueous PEDOT:PSS can be deposited onto graphene anode uniformly; hence the following fabrication process can be achieved to complete the solution-processed OPV. The morphological studies of graphene/HBC-6ImBr composite films were performed via atomic force microscope(AFM) to check the capabilities of surface modification. In the end of this thesis, a decent power conversion efficiency of 3.65% with a fill factor around 50% for P3HT:PCBM BHJ solar cell using graphene anode has been achieved by incorporating the anode modification of tri-layer HBC-6ImBr.
Subjects
Perovskite solar cell
Vapor-assisted solution process
HBC-6ImBr (Hexa-peri-hexabenzocoronene-6ImBr)
graphene anode
SDGs
Type
thesis
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