Teng Liao,Aodong Zhu,Yuanzhu Jiang,Wang Zhao,Mengmeng Cheng,Junyan Xiao,Yi-Bing Cheng
Carbon-based top electrodes have significant value in enhancing the stability and reducing the cost of perovskite solar cells (PSCs). However, the fabrication process for carbon-based top electrodes in large-area, high-performance perovskite solar modules (PSMs) still lacks practical techniques. In this work, we reference the bag moulding process and use a plasticine-like uncured carbon paste to prepare the top electrode for small-area PSCs and PSMs. Benefiting from the uniform pressure provided by the bag pressing process, this carbon electrode can make sufficiently good electrical contact with the hole transport layer in the large-area device in a single pass. After further removing excess fluid, the device can achieve efficiencies of 18.57 % (∼0.15 cm 2 ) and 14.44 % (∼10 cm 2 ) with good stability. This convenient top electrode preparation method at room temperature offers a novel technological solution for the commercial application of large-area PSMs.
Carbon electrodes are a promising alternative to metal electrodes in the access of high-stable and low-cost perovskite solar cells (PSCs). However, polar components (including cyclohexanone, terpineol, etc.) in commercial carbon pastes for carbon electrodes usually corrode perovskite materials, thereby deteriorating the photovoltaic performance of the resulting solar cells. Therefore, the development of perovskite-compatible carbon pastes and carbon electrodes is of great significance in obtaining high-performance carbon-based PSCs. Herein, carbon pastes based on low polar alkane solvents are developed for perovskite-compatible carbon electrode (PCCE) in the construction of carbon-based CsPbI 2 Br PSCs. The optimized cells based on PCCE offer a champion efficiency of 13.16% ( J SC = 14.33 mA cm −2 , V OC = 1.22 V, and fill factor (FF) = 0.75), which is remarkably higher than that of commercial carbon paste-derived counterparts (11.51%). Even without encapsulation, CsPbI 2 Br PSCs based on PCCE maintain over 93% of their initial efficiency in an air atmosphere with a humidity of 30–40% for over 1000 h.
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