Promising Rise of Optimum Efficiency in Double Junction Organic Tandem Solar Cells

摘要

To achieve high efficiency for organic solar cells, tandem structures have been constructed. In this paper, we suggest a numerical study on the optimization of the thicknesses of organic tandem solar cells (OTSCs) based on common materials with high availability, poly(3-hexylthiophene) (P3HT) and polythieno[3,4-b]-thiophene-co-benzodithiophene (PTB7). Based on the results of optical simulations, the optimized design of an OTSC is made possible in terms of a broad spectral response and high efficiency. To achieve high efficiency and a short circuit current (J(SC)), we suggest a rational design via thickness optimization of each subcell for OTSC. A combined thickness of 200 nm and 200 nm for each single OPV cell is proposed for OTSC to realize a current matching with 8.00 mA/cm(2) of J(SC). Accordingly, a maximum power conversion efficiency (PCE) is achieved up to 10.11%.