Proceedings of International Conference on Hybrid and Organic Photovoltaics (HOPV16)
Publication date: 28th March 2016
In this poster we compare n type, TiO2 blocking layers deposited via spray pyrolysis against a novel method of depositing TiO2 blocking layers with post processing utilising a Nd: YVO4 sourced laser to electronically isolate the film in the desired regions. As opposed to chemical etching with zinc powder and hydrochloric acid.
We report laser ablated Perovskite based devices with a peak power conversion efficiency of 13.4%, using the specially deposited TiO2 blocking layer and a conventional Meso-structured TiO2 scaffold, MAPbI3, SPIRO-OMeTAD, Au stack deposited via sequential deposition.
Characterisation of the blocking layers was carried out using cyclic voltammetry (CV) which provided evidence that the new method of depositing the blocking layer is as effective, if not more so, than conventional blocking layers deposited via spray pyrolysis and sintering at high temperature. CV also allows us to detect the frequency of pinholes observed in the film thus giving an indication of the films homogeneity. Atomic force microscopy and optical microscopy were used to see the effects of laser ablation and the resultant edge definition as well as to map the cavity created. Profilometry allowed data to be collected regarding the roughness of ablated films, while UV Vis data provided information on how the transmission of light through the laser ablated films compared to non-ablated samples. In addition to this we also characterised the effects of the Meso-porous TiO2 ability to act as a blocking layer (n type) using the same techniques mentioned previously.
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