School of Chemical Engineering and Technology, Tianjin University, 300072, Tianjin, China.
Laboratory of Photonics and Interfaces, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), Station 6, CH-1015, Lausanne, Switzerland.
Adv Mater. 2017 May;29(17). doi: 10.1002/adma.201606806. Epub 2017 Feb 27.
A fullerene derivative (α-bis-PCBM) is purified from an as-produced bis-phenyl-C -butyric acid methyl ester (bis-[60]PCBM) isomer mixture by preparative peak-recycling, high-performance liquid chromatography, and is employed as a templating agent for solution processing of metal halide perovskite films via an antisolvent method. The resulting α-bis-PCBM-containing perovskite solar cells achieve better stability, efficiency, and reproducibility when compared with analogous cells containing PCBM. α-bis-PCBM fills the vacancies and grain boundaries of the perovskite film, enhancing the crystallization of perovskites and addressing the issue of slow electron extraction. In addition, α-bis-PCBM resists the ingression of moisture and passivates voids or pinholes generated in the hole-transporting layer. As a result, a power conversion efficiency (PCE) of 20.8% is obtained, compared with 19.9% by PCBM, and is accompanied by excellent stability under heat and simulated sunlight. The PCE of unsealed devices dropped by less than 10% in ambient air (40% RH) after 44 d at 65 °C, and by 4% after 600 h under continuous full-sun illumination and maximum power point tracking, respectively.
一种富勒烯衍生物（α-双-PCBM）从粗产物双-苯基-C-丁酸甲酯（双-[60]PCBM）异构体混合物中通过制备性峰循环、高效液相色谱法纯化，并作为模板剂用于通过反溶剂法处理金属卤化物钙钛矿薄膜。与含有 PCBM 的类似电池相比，所得含有 α-双-PCBM 的钙钛矿太阳能电池具有更好的稳定性、效率和可重复性。α-双-PCBM 填充钙钛矿薄膜的空位和晶界，增强钙钛矿的结晶，并解决电子提取缓慢的问题。此外，α-双-PCBM 抵抗水分的侵入，并使空穴传输层中产生的空隙或针孔钝化。结果，获得了 20.8%的功率转换效率（PCE），而 PCBM 为 19.9%，并且在热和模拟阳光下具有出色的稳定性。未密封器件在 65°C 下 44 天后在 40%相对湿度的环境空气中的 PCE 下降小于 10%，并且在连续全阳光照射和最大功率点跟踪下 600 小时后下降 4%。
