Efficient, stable solar cells by using inherent bandgap of α-phase formamidinium lead iodide
Efficient, stable solar cells by using inherent bandgap of α-phase formamidinium lead iodide
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DOI：
10.1126/science.aay7044
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发表时间：
2019-11-08
期刊：
影响因子：
56.9
通讯作者：
Seok, Sang Il
中科院分区：
文献类型：
--
作者：
Min, Hanul;Kim, Maengsuk;Seok, Sang Il
通常，含有甲酰胺(FA)、甲铵(MA)、铯、碘和溴离子的混合阳离子和阴离子被用来稳定钙钛矿太阳能电池中FA基三碘化铅(FAPbI(3))的黑色α相。然而，MA、铯和溴等添加剂使其禁带宽度变宽，热稳定性降低。我们通过掺杂亚甲二氯二铵(MDACl(2))稳定了α-FAPbI(3)相，并获得了每平方厘米26.1至26.7毫安的认证短路电流密度。经认证的功率转换效率(PCE)为23.7%，在600小时的运行后仍保持90%以上的初始效率，并在包括紫外光在内的环境条件下，在全阳光照射下跟踪最大功率点。即使在150摄氏度的空气中退火20小时后，未封装的设备仍保持其初始PCE的90%以上，并且与由MAPbBR(3)稳定FAPbI(3)的控制设备相比，显示出更好的热稳定性和湿度稳定性。
In general, mixed cations and anions containing formamidinium (FA), methylammonium (MA), caesium, iodine, and bromine ions are used to stabilize the black alpha-phase of the FA-based lead triiodide (FAPbI(3)) in perovskite solar cells. However, additives such as MA, caesium, and bromine widen its bandgap and reduce the thermal stability. We stabilized the alpha-FAPbI(3) phase by doping with methylenediammonium dichloride (MDACl(2)) and achieved a certified short-circuit current density of between 26.1 and 26.7 milliamperes per square centimeter. With certified power conversion efficiencies (PCEs) of 23.7%, more than 90% of the initial efficiency was maintained after 600 hours of operation with maximum power point tracking under full sunlight illumination in ambient conditions including ultraviolet light. Unencapsulated devices retained more than 90% of their initial PCE even after annealing for 20 hours at 150 degrees C in air and exhibited superior thermal and humidity stability over a control device in which FAPbI(3) was stabilized by MAPbBr(3).