Abstract
We have studied the fabrication of an inverted P3HT:PC 71BM bulk hetero-junction (IBHJ) solar cell using ultrathin cesium carbonate (Cs 2CO 3) and molybdenum trioxide (MoO 3) as the cathodic and anodic buffer layers, respectively. The influence of MoO 3 thickness on the performance of the IBHJ solar cells was investigated for thicknesses ranging from 0.75 to 3 nm and the optimum thickness was found to be 2 nm, which showed the highest power conversion efficiency of 4.01%. We also found that the power conversion efficiency of the IBHJ solar cells is relatively retained even in low temperature while that of BHJ solar cell rapidly decreased with decreasing temperature and the stability in air is also much better.
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