Effect of an Ultra-thin Molybdenum Trioxide Layer and Illumination Intensity on the Performance of Organic Photovoltaic Devices

Abstract

The effect of an ultra-thin molybdenum trioxide (MoO 3 ) layer thickness inserted between the indium tin oxide (ITO) substrate and copper phthalocyanine (CuPc) layer on the performance of organic photovoltaic devices (OPVs) was studied. Experimental results demonstrate that the short-circuit current density (J sc ) was decreased slightly with the increase of MoO 3 thickness; meanwhile, the fill factor (FF) was increased from 53.5 to 57.7%, respectively, leading to the improved power conversion efficiency with the optimal thickness of MoO 3 (1 nm). The experimental results also reveal that the Ohmic contact is formed with the deposition of MoO 3 . Further, the effect of the MoO 3 layer was checked from the variation of the performance of OPVs under different illumination intensities. It was found that the MoO 3 layer could effectively prevent exciton quenching at the ITO anode side, resulting in the small variation of the FF for the devices with the MoO 3 layer compared to the devices without the MoO 3 layer under high illumination intensity.

Efficient hole‐transporting layer MoO3:CuI deposited by co‐evaporation in organic photovoltaic cells

“…For this purpose, different inorganic layers were proposed such as ultrathin gold film or transition‐metal oxide . Among the transition‐metal oxides, MoO 3 was shown to be a very suitable ABL . Actually, MoO 3 is very efficient in optimizing the hole extraction due to its high work function that allows a good agreement with the HOMO value of the ED.…”

XPS study of the band alignment at ITO/oxide (n‐type MoO3 or p‐type NiO) interface

“…Many papers have shown that the introduction between the anode, which is usually an ITO film, and the organic electron donor, of a buffer layer [anode buffer layer (ABL)] produces significant improvement in the OPVCs performances 5. For instance, it has been shown that a MoO 3 3–10 or NiO 11–15 thin film is very efficient to improve the device performances and stability. However, even though the MoO 3 is n‐type 16, NiO is p‐type 15, nevertheless both buffer layers are efficient.…”

Enhanced cell performance by controlling the surface morphology of ZnO buffer layers in organic photovoltaic cells

“…Recently, the cell performance of OPVs was sharply increased up to 8-12% with changing the various parameters (open circuit voltage (V oc ), current density (J sc ), fill factor (FF) and resistance, etc.) (Park et al, 2010;Zhang et al, 2010;Li et al, 2012;Kim et al, 2013Kim et al, , 2014. In order to get the high PCE of OPVs, it is important to decrease the resistance between the buffer layer and active layer because http://dx.doi.org/10.1016/j.solener.2015.07.047 0038-092X/Ó 2015 Elsevier Ltd. All rights reserved.…”