Chen Lijia, Cai Lun, Niu Lianbin, Guo Pan, Song Qunliang
College of Physics and Electronics Engineering, Chongqing Normal University, Chongqing 401331, China.
School of Materials, Sun Yat-sen University, Shenzhen 518107, China.
Micromachines (Basel). 2021 Oct 22;12(11):1295. doi: 10.3390/mi12111295.
Although the effect of high temperature on the performance of organic solar cells has been widely investigated, it is inevitably influenced by the associated annealing effect (which usually leads to film morphology change and variation in electrical properties), which makes the discussion more sophisticated. In this study, we simplified the issue and investigated the influence of low temperatures (from room temperature to 77 K) on the photocurrent and internal/external quantum efficiency of a CuPc/C60 based solar cell. We found that besides the charge dynamic process (charge transport), one or more of the exciton dynamic processes, such as exciton diffusion and exciton dissociation, also play a significant role in affecting the photocurrent of organic solar cells at different temperatures. Additionally, the results showed that the temperature had negligible influence on the absorption of the CuPc film as well as the exciton generation process, but obviously influenced the other two exciton dynamic processes (exciton diffusion and exciton dissociation).
尽管高温对有机太阳能电池性能的影响已得到广泛研究，但它不可避免地受到相关退火效应（通常导致薄膜形态变化和电学性质改变）的影响，这使得讨论更加复杂。在本研究中，我们简化了问题，研究了低温（从室温到77 K）对基于CuPc/C60的太阳能电池的光电流和内/外量子效率的影响。我们发现，除了电荷动力学过程（电荷传输）外，一个或多个激子动力学过程，如激子扩散和激子解离，在不同温度下对有机太阳能电池的光电流影响中也起着重要作用。此外，结果表明，温度对CuPc薄膜的吸收以及激子产生过程的影响可忽略不计，但对其他两个激子动力学过程（激子扩散和激子解离）有明显影响。
