Yuan Zhengtian, Zhang Mengyuan, Yen Zhihao, Feng Minjun, Jin Xin, Ibrahim Ahmad, Ahmed Mahmoud G, Salim Teddy, Gonçalves Rui A, Sum Tze Chien, Lam Yeng Ming, Wong Lydia H
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore.
Singapore-HUJ Alliance for Research and Enterprise (SHARE), Nanomaterials for Energy and Energy-Water Nexus (NEW), Campus for Research Excellence and Technological Enterprise (CREATE), Singapore 138602, Singapore.
ACS Appl Mater Interfaces. 2023 Aug 9;15(31):37629-37639. doi: 10.1021/acsami.3c03804. Epub 2023 Jul 18.
Semi-transparent perovskite solar cells (ST-PSCs) have attracted enormous attention recently due to their potential in building-integrated photovoltaic. To obtain adequate average visible transmittance (AVT), a thin perovskite is commonly employed in ST-PSCs. While the thinner perovskite layer has higher transparency, its light absorption efficiency is reduced, and the device shows lower power conversion efficiency (PCE). In this work, a combination of high-quality transparent conducting layers and surface engineering using 2D-MXene results in a superior PCE. In situ high-temperature X-ray diffraction provides direct evidence that the MXene interlayer retards the perovskite crystallization process and leads to larger perovskite grains with fewer grain boundaries, which are favorable for carrier transport. The interfacial carrier recombination is decreased due to fewer defects in the perovskite. Consequently, the current density of the devices with MXene increased significantly. Also, optimized indium tin oxide provides appreciable transparency and conductivity as the top electrode. The semi-transparent device with a PCE of 14.78% and AVT of over 26.7% (400-800 nm) was successfully obtained, outperforming most reported ST-PSCs. The unencapsulated device maintained 85.58% of its original efficiency after over 1000 h under ambient conditions. This work provides a new strategy to prepare high-efficiency ST-PSCs with remarkable AVT and extended stability.
半透明钙钛矿太阳能电池（ST-PSCs）因其在建筑一体化光伏方面的潜力，近年来备受关注。为了获得足够的平均可见光透过率（AVT），ST-PSCs中通常采用较薄的钙钛矿层。虽然较薄的钙钛矿层具有更高的透明度，但其光吸收效率会降低，且器件的功率转换效率（PCE）也较低。在这项工作中，高质量透明导电层与使用二维MXene的表面工程相结合，实现了卓越的PCE。原位高温X射线衍射提供了直接证据，表明MXene中间层阻碍了钙钛矿的结晶过程，导致形成更大的钙钛矿晶粒且晶界更少，这有利于载流子传输。由于钙钛矿中的缺陷减少，界面载流子复合降低。因此，含有MXene的器件的电流密度显著增加。此外，优化后的氧化铟锡作为顶部电极，具有可观的透明度和导电性。成功制备出了PCE为14.78%、AVT超过26.7%（400 - 800 nm）的半透明器件，性能优于大多数已报道的ST-PSCs。未封装的器件在环境条件下经过1000多小时后，仍保持其原始效率的85.58%。这项工作为制备具有卓越AVT和延长稳定性的高效ST-PSCs提供了一种新策略。
