Yeon Deuk Ho, Mohanty Bhaskar Chandra, Lee Che Yoon, Lee Seung Min, Cho Yong Soo
Department of Materials Science and Engineering, Yonsei University, Seoul 03722, Korea.
R&D Center, LG Display Co., Ltd., Paju-si 10845, Gyeonggi-do, Korea.
ACS Omega. 2017 Aug 23;2(8):4894-4899. doi: 10.1021/acsomega.7b00999. eCollection 2017 Aug 31.
The device architecture of solar cells remains critical in achieving high photoconversion efficiency while affordable and scalable routes are being explored. Here, we demonstrate a scalable, low cost, and less toxic synthesis route for the fabrication of PbS/CdS thin-film solar cells with efficiencies as high as ∼5.59%, which is the highest efficiency obtained so far for the PbS-based solar cells not involving quantum dots. The devices use a stack of two band-aligned junctions that facilitates absorption of a wider range of the solar spectrum and an architectural modification of the electron-accepting electrode assembly consisting of a very thin CdS layer (∼10 nm) supported by vertically aligned ZnO nanorods on a ∼50 nm thick ZnO underlayer. Compared to a planar electrode of a 50 nm thick CdS film, the modified electrode assembly enhanced the efficiency by ∼39% primarily due to a significantly higher photon absorption in the PbS layer, as revealed by a detailed three-dimensional finite difference time-domain optoelectronic modeling of the device.
在探索经济实惠且可扩展的途径时，太阳能电池的器件架构对于实现高光电转换效率仍然至关重要。在此，我们展示了一种可扩展、低成本且毒性较小的合成路线，用于制造效率高达约5.59%的PbS/CdS薄膜太阳能电池，这是迄今为止不涉及量子点的PbS基太阳能电池所获得的最高效率。这些器件使用了两个能带对齐的结的堆叠结构，这有助于吸收更广泛的太阳光谱，并且对电子接受电极组件进行了结构改进，该组件由在约50 nm厚的ZnO底层上垂直排列的ZnO纳米棒支撑的非常薄的CdS层（约10 nm）组成。与50 nm厚的CdS薄膜的平面电极相比，改进后的电极组件使效率提高了约39%，这主要是由于PbS层中显著更高的光子吸收，这一点通过对该器件进行详细的三维时域有限差分光电建模得以揭示。
