Shi Yanying, Cheng Xusheng, Wang Yudi, Li Wenrui, Shang Wenzhe, Liu Wei, Lu Wei, Cheng Jiashuo, Liu Lida, Shi Yantao
State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, School of Chemistry, Dalian University of Technology, Dalian, 116024, People's Republic of China.
School of Narcotics Control and Public Order Studies, Criminal Investigation Police, University of China, Shenyang, 110854, People's Republic of China.
Nanomicro Lett. 2025 Jan 31;17(1):125. doi: 10.1007/s40820-024-01639-3.
Carbon-based perovskite solar cells (C-PSCs) exhibit notable stability and durability. However, the power conversion efficiency (PCE) is significantly hindered by energy level mismatches, which result in interfacial charge transport barriers at the electrode-related interfaces. Herein, we report a back electrode that utilizes atomically dispersed metallic cobalt (Co) in carbon nanosheets (Co/CN) to adjust the interfacial energy levels. The electrons in the d-orbitals of Co atoms disrupt the electronic symmetry of the carbon nanosheets (CN), inducing a redistribution of the electronic density of states that leads to a downward shift in the Fermi level and a significantly reduced interfacial energy barrier. As a result, the C-PSCs using Co/CN as back electrodes achieve a notable PCE of 22.61% with exceptional long-term stability, maintaining 94.4% of their initial efficiency after 1000 h of continuous illumination without encapsulation. This work provides a promising universal method to regulate the energy level of carbon electrodes for C-PSCs and paves the way for more efficient, stable, and scalable solar technologies toward commercialization.
碳基钙钛矿太阳能电池（C-PSCs）具有显著的稳定性和耐久性。然而，能级不匹配严重阻碍了功率转换效率（PCE），这在与电极相关的界面处导致了界面电荷传输障碍。在此，我们报道了一种背电极，它利用碳纳米片中原子分散的金属钴（Co）来调节界面能级。Co原子d轨道中的电子破坏了碳纳米片（CN）的电子对称性，引发了态密度的重新分布，导致费米能级向下移动，界面能垒显著降低。结果，使用Co/CN作为背电极的C-PSCs实现了22.61%的显著PCE，具有出色的长期稳定性，在无封装的情况下连续光照1000小时后仍保持其初始效率的94.4%。这项工作为调节C-PSCs碳电极的能级提供了一种有前景的通用方法，并为更高效、稳定和可扩展的太阳能技术走向商业化铺平了道路。
