In this paper we have experimentally studied the electrical behavior of organic solar cells (OSCs) under mechanical strain in dark condition. Dark current-voltage characteristics of solar cells provide valuable information on the defect states inside the device. The samples under tests here are two commercial polymeric solar cells with different electrode types. So, instead of studying merely the dark current changes of the solar cells versus strain, the electrodes effects due to the applied strain are compared at different environment temperatures. The most important electrical parameters of the strained cells are extracted as a function of the strain at different temperatures for two conditions: when the cells are under strain and when they are relaxed for 3 min after applying the strain. The only parameter that shows a considerable meaningful change by strain is the series resistance. The final results confirm that the cell with silver electrodes, shows a current increase by tensile strain due to the polymeric chains alignment along the strain direction. But the cell with carbon electrodes experiences a current decrement by increasing the strain. We believe that the carbon electrode, due to the larger carbon Young's modulus, in comparison with the silver electrode cells creates more defect states in the flexible polymeric cells under the same amount of the applied strain. Furthermore, the cell with softer and more stretchable silver grid electrodes can withstand a higher level of strain before suffering any permanent damage.

在本文中，我们通过实验研究了在黑暗条件下机械应变下有机太阳能电池（OSC）的电性能。太阳能电池的暗电流-电压特性可提供有关设备内部缺陷状态的有价值的信息。此处测试的样品是两个电极类型不同的商用聚合物太阳能电池。因此，除了仅研究太阳能电池的暗电流变化与应变的关系以外，还比较了在不同环境温度下由于施加的应变而产生的电极效应。在以下两个条件下，根据应变在不同温度下提取应变细胞的最重要的电参数：细胞处于应变状态和施加应变后3分钟放松。唯一可以显示出有意义的应变变化的参数是串联电阻。最终结果证实，由于聚合物链沿应变方向排列，具有银电极的电池显示电流因拉伸应变而增加。但是带有碳电极的电池会通过增加应变而使电流减小。我们相信，由于碳杨氏模量较大，与银电极电池相比，碳电极在相同的施加应变量下会在柔性聚合物电池中产生更多的缺陷状态。此外，具有更柔软和更易拉伸的银栅电极的电池在遭受任何永久性损害之前可以承受更高水平的应变。由于聚合物链沿应变方向排列，图1显示了电流因拉伸应变而增加。但是带有碳电极的电池会通过增加应变而使电流减小。我们相信，由于碳杨氏模量较大，与银电极电池相比，碳电极在相同的施加应变量下会在柔性聚合物电池中产生更多的缺陷状态。此外，具有更柔软和更易拉伸的银栅电极的电池在遭受任何永久性损害之前可以承受更高水平的应变。由于聚合物链沿应变方向排列，图1显示了电流因拉伸应变而增加。但是带有碳电极的电池会通过增加应变而使电流减小。我们相信，由于碳杨氏模量较大，与银电极电池相比，碳电极在相同的施加应变量下会在柔性聚合物电池中产生更多的缺陷状态。此外，具有更柔软和更易拉伸的银栅电极的电池在遭受任何永久性损害之前可以承受更高水平的应变。由于较大的碳杨氏模量，与银电极电池相比，在相同的施加应变量下，柔性聚合物电池会产生更多的缺陷状态。此外，具有更柔软和更易拉伸的银栅电极的电池在遭受任何永久性损害之前可以承受更高水平的应变。由于较大的碳杨氏模量，与银电极电池相比，在相同的施加应变量下，柔性聚合物电池会产生更多的缺陷状态。此外，具有更柔软和更易拉伸的银栅电极的电池在遭受任何永久性损害之前可以承受更高水平的应变。