Efficient and stable perovskite solar cells based on blade-coated CH3NH3PbI3 thin films fabricated using “green” solvents under ambient conditions
Efficient and stable perovskite solar cells based on blade-coated CH3NH3PbI3 thin films fabricated using “green” solvents under ambient conditions
复制标题
DOI：
10.1016/j.orgel.2023.106763
复制
发表时间：
2023-02
影响因子：
3.2
通讯作者：
P. Baral;Xinwen Zhang;Kelsey Garden;Nilave Chakraborty;Lening Shen;Zikun Cao;X. Gong;Luisa Whittaker‐Brooks;He Wang
中科院分区：
文献类型：
--
作者：
P. Baral;Xinwen Zhang;Kelsey Garden;Nilave Chakraborty;Lening Shen;Zikun Cao;X. Gong;Luisa Whittaker‐Brooks;He Wang
金属卤化物钙钛矿由于其特殊的光学和电子特性，被认为是近十年来最有前途的太阳能电池候选者。当将金属卤化物钙钛矿作为太阳能电池的有源层时，其功率转换效率已经可以与传统硅太阳能电池相媲美。然而，金属卤化物钙钛矿的稳定性、放大、绿色溶剂的使用和在环境条件下的制造需要解决商业应用。在这里，我们报道了在环境条件下，以甲胺和乙腈作为“绿色”溶剂，制备了叶片涂覆甲基铵碘化铅（MAPbI3）钙钛矿薄膜。我们的钙钛矿薄膜最初由低纯度PbI2（99%）制备，并在相对湿度（RH）高于30%的干燥空气中进行叶片涂覆。与自旋镀膜方法（50μL-60μL）相比，通过叶片镀膜方法制备钙钛矿薄膜的一个显著优点是，在4 cm2的衬底上使用的前驱体量（5 μL）最少。加入少量的有机卤化物盐，即苯乙基氯化铵，提高了薄膜的结晶度，抑制了非辐射复合，使功率转换效率达到20%以上。此外，在开路条件下，在50°C， 60% RH下，在1太阳的连续光照下，该器件在500 h后保持95%以上的初始效率。上述方法为钙钛矿太阳能电池的商业化制造开辟了道路。
Metal halide perovskites are considered the most promising candidates for solar cells of the decade due to their exceptional optical and electronic properties. The power conversion efficiency of metal halide perovskites, when incorporated as the active layer of solar cells, has become comparable to that observed for conventional silicon solar cells. However, the stability, scaleup, green solvent usage, and fabrication in ambient conditions of metal halide perovskites need to be solved for commercial applications. Here, we report the fabrication of blade-coated methylammonium lead iodide (MAPbI3) perovskite thin films using methylamine and acetonitrile as “green” solvents under ambient conditions. Our perovskite films are initially prepared from low purity PbI2(99%) and are blade-coated in dry air at relative humidity (RH) levels above 30%. A significant advantage of fabricating our perovskite thin films via blade-coating protocols is that there is a minimal amount of precursors (5 μL) used compared to spin-coating methods (50μL–60μL) for a 4 cm2substrate. With the addition of a small amount of an organic halide salt, namely, phenethylammonium chloride, the film crystallinity is improved and non-radiative recombination is suppressed, resulting in power conversion efficiencies over 20%. In addition, the device maintains more than 95% of its initial efficiency after 500 h under continuous light illumination of 1-sun at open circuit conditions, 50 °C and 60% RH. The above method leads a path towards the commercial fabrication of perovskite solar cells.