Yang Weichuang, Ding Bin, Lin Zedong, Sun Jingsong, Meng YuanYuan, Ding Yong, Sheng Jiang, Yang Zhenhai, Ye Jichun, Dyson Paul J, Nazeeruddin Mohammad Khaja
Zhejiang Provincial Engineering Research Center of Energy Optoelectronic Materials and Devices, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences (CAS), Ningbo, 315201, P. R. China.
University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Adv Mater. 2023 Sep;35(35):e2302071. doi: 10.1002/adma.202302071. Epub 2023 Jul 12.
Currently, the full potential of perovskite solar cells (PSCs) is limited by chargecarrier recombination owing to imperfect passivation methods. Here, the recombination loss mechanisms owing to the interfacial energy offset and defects are quantified. The results show that a favorable energy offset can reduce minority carriers and suppress interfacial recombination losses more effectively than chemical passivation. To obtain high-efficiency PSCs, 2D perovskites are promising candidates, which offer powerful field effects and require only modest chemical passivation at the interface. The enhanced passivation and charge-carrier extraction offered by the 2D/3D heterojunction PSCs has boosted their power conversion efficiency to 25.32% (certified 25.04%) for small-size devices and to 21.48% for a large-area module (with a designated area of 29.0 cm ). Ion migration is also suppressed by the 2D/3D heterojunction, such that the unencapsulated small-size devices maintain 90% of their initial efficiency after 2000 h of continuous operation at the maximum power point.
目前，由于钝化方法不完善，钙钛矿太阳能电池（PSC）的全部潜力受到电荷载流子复合的限制。在此，对由于界面能量偏移和缺陷导致的复合损失机制进行了量化。结果表明，有利的能量偏移比化学钝化更能有效地减少少数载流子并抑制界面复合损失。为了获得高效的PSC，二维钙钛矿是很有前景的候选材料，其具有强大的场效应，并且在界面处仅需要适度的化学钝化。二维/三维异质结PSC提供的增强钝化和电荷载流子提取能力，已将小尺寸器件的功率转换效率提高到25.32%（认证值为25.04%），大面积模块（指定面积为29.0平方厘米）的功率转换效率提高到21.48%。二维/三维异质结还抑制了离子迁移，使得未封装的小尺寸器件在最大功率点连续运行2000小时后仍能保持其初始效率的90%。
