Bi Sheng, Ouyang Zhongliang, Guo Qinglei, Jiang Chengming
Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education, Dalian University of Technology Dalian 116024 P. R. China
Institute of Photoelectric Nanoscience and Nanotechnology, Dalian University of Technology Dalian 116024 P. R. China.
RSC Adv. 2018 Feb 9;8(12):6519-6526. doi: 10.1039/c7ra13219k. eCollection 2018 Feb 6.
Bulk heterojunction organic solar cells (OSCs) have attracted worldwide attention due to their great potential as a green, flexible and low-cost renewable energy source. A vertical configuration in the active layer due to the aggregation of donor and acceptor molecules and the influence on the performance of OSCs deserve an in-depth study. In this study, five different vertical configurations of the active layer in OSCs were built up. The absorbance and indexes of the devices were theoretically analyzed. It was found that the configuration with the donor and acceptor molecules distributed equally exhibits the highest power conversion efficiency, followed by the configuration with the donor closer to the anode and the acceptor closer to the cathode, which matches experimental results well. Further analyses present the recombination, resistance, quantum efficiency and current leakage of all the configurations. It is anticipated that our results will promote the better understanding and development of the OSC field.
体异质结有机太阳能电池（OSCs）因其作为绿色、柔性和低成本可再生能源的巨大潜力而受到全球关注。由于供体和受体分子的聚集导致活性层中的垂直结构以及对OSCs性能的影响值得深入研究。在本研究中，构建了OSCs活性层的五种不同垂直结构。从理论上分析了器件的吸光度和各项指标。发现供体和受体分子均匀分布的结构表现出最高的功率转换效率，其次是供体靠近阳极而受体靠近阴极的结构，这与实验结果吻合良好。进一步分析给出了所有结构的复合、电阻、量子效率和电流泄漏情况。预计我们的结果将促进对OSC领域的更好理解和发展。
