Abstract
Vanadium pentoxide (V2O5) was inserted between the donor layer and the anode as a hole‐extracting nanolayer. Compared with devices without a hole‐extracting layer, short‐circuit current density (JSC), open‐circuit voltage (VOC), fill factor (FF), and power conversion efficiency (PCE) of rubrene/C70‐based heterojunction solar cells with 3 nm V2O5 nanolayer are enhanced by 99%, 73%, 20%, and 310%, respectively. We found that V2O5 interlayer can effectively suppress the contact resistance and increase the hole transport capability. The dependence of the device performance on V2O5 layer thickness as well as fill factor on exciton dissociation and charge transport was also investigated in detail.
Highlights
Solar cells are presently considered as an important source of renewable and green energy to solve the energy crisis
Recent literatures have extensively focused on transition metal oxides (TMO) because of their favorable electronic properties, low optical absorption in the visible spectrum, and high level of technological compatibility in organic electronics [12]
VOC are by inserting a 3 nm V2O5 interlayer between the donor layer and anode, the device exhibits a significant improvement in power conversion efficiency (PCE) to 1.74%, with short-circuit current density (JSC) 4.58 mA/cm2, open-circuit voltage (VOC) 0.88 V, and fill factor (FF) 43.3%
Summary
Solar cells are presently considered as an important source of renewable and green energy to solve the energy crisis. Improvements in the performance of OSCs are commonly achieved by inserting a hole-extracting layer between the indium tin oxide (ITO) transparent conducting electrode and the organic donor materials. Poly(3, 4-ethylenedioxythiophene) : poly(styrenesulfonate) (PEDOT : PSS) is one of the most commonly used holeextracting layers in OSCs. PEDOT : PSS is burdened with electrical inhomogeneity which limits electron blocking capability as well as acidic nature which limits the stability and the lifetime of the device [10, 11]. PEDOT : PSS is burdened with electrical inhomogeneity which limits electron blocking capability as well as acidic nature which limits the stability and the lifetime of the device [10, 11] This has driven the vigorous development of better hole-extracting layers. Molybdenum trioxide (MoO3) [13], vanadium pentoxide (V2O5) [14], and tungsten trioxide (WO3) [15] have been shown to be promising alternatives to PEDOT : PSS
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