Proceedings of International Conference Asia-Pacific Hybrid and Organic Photovoltaics 2018 (AP-HOPV18)
DOI: https://doi.org/10.29363/nanoge.ap-hopv.2018.052
Publication date: 27th October 2017
Perovskite solar cells (PSCs) experienced dramatic increase in efficiency from less than 4% in 2009 to higher than 22% in 2016. Sandwich structure is commonly employed as the device structure where the perovskite light absorber is sandwiched in between of the anode and cathode. This requires incident light passing through one of the electrode, which is usually transparent conductive oxide (TCO), before reaching the perovskite layer. In this case, shading caused by the electrode can introduce parasitic absorption to the solar cells. However, shading caused by the front electrode is completely eliminated by using back-contact (BC) design, in which the two sets of electrodes are located at the same side of the light absorber, to replace the conventional configuration. In this work, we present a unique design of BC PSCs acquiring the idea of quasi-interdigitated electrode (QIDE), namely the electron-collecting electrode and hole-collecting electrode are separated at two planes with an insulator in between. Most importantly, our QIDE is designed to honeycomb structure, which has higher structural robustness, better defect tolerance and improved charge collecting efficiency, with which we achieved high short-circuit current and stabilized power output. In addition to the minimized parasitic absorption from the front electrode, PSCs with the BC architecture also allow the direct observation of the perovskite layer during solar cell operation , which might open a window to the research of PSCs. A schematic diagram of the device is shown in the attachment.
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