Institute of Functional Nano and Soft Materials (FUNSOM) & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University , Suzhou 215123, China.
ACS Appl Mater Interfaces. 2013 Oct 23;5(20):10185-90. doi: 10.1021/am402872u. Epub 2013 Oct 4.
Significantly enhanced performances of semitransparent inverted organic photovoltaic devices have been realized by simply introducing a high reflector structure, which comprises several pairs of MoO3/LiF with a thickness of 60 nm for MoO3 and 90 nm for LiF, respectively. After optimizing the reflector structure, the enhanced light harvesting is achieved, and thus the increased optical current is obtained. The short-circuit current density (JSC) and power conversion efficiency (PCE) are increased to 10.9 mA cm(-2) and 4.32%, compared to 8.09 mA cm(-2) and 3.36% in the control device. This leads to a 30% enhancement in PCE. According to the experimental and simulated results, the improved performance is attributed to the effective reflection of light at the wavelength from 450 to 600 nm, which corresponds to the absorption range of the active layer. The demonstrated light-trapping approach is expected to be an effective method to realize the high efficiency in semitransparent organic photovoltaic devices.
通过简单引入高反射器结构，显著提高了半透明倒置有机光伏器件的性能，该高反射器结构由几对 MoO3/LiF 组成，MoO3 的厚度为 60nm，LiF 的厚度为 90nm。优化反射器结构后，实现了增强的光捕获，从而获得了增加的光电流。与对照器件的 8.09mA/cm2 和 3.36%相比，短路电流密度（JSC）和功率转换效率（PCE）分别提高到 10.9mA/cm2 和 4.32%。这导致 PCE 提高了 30%。根据实验和模拟结果，性能的提高归因于在对应于活性层吸收范围的 450nm 至 600nm 的波长处有效反射光。所展示的光捕获方法有望成为实现半透明有机光伏器件高效率的有效方法。
