Efficient Vacuum-Deposited Perovskite Solar Cells with Stable Cubic FA1–xMAxPbI3,ACS Energy Letters

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Efficient Vacuum-Deposited Perovskite Solar Cells with Stable Cubic FA1–xMAxPbI3
ACS Energy Letters ( IF 19.3 ) Pub Date : 2020-08-26 , DOI: 10.1021/acsenergylett.0c01473
Lidón Gil-Escrig ₁ , Chris Dreessen ₁ , Ismail Cihan Kaya _{1,

2} , Beom-Soo Kim ₁ , Francisco Palazon ₁ , Michele Sessolo ₁ , Henk J. Bolink ₁

Affiliation

Preparation of black formamidinium lead iodide (FAPbI₃) requires high-temperature annealing and the incorporation of smaller A-site cations, such as methylammonium (MA⁺), cesium, or rubidium. A major advantage of vacuum processing is the possibility to deposit perovskite films at room temperature (RT), without any annealing step. Here we demonstrate stabilization of the cubic perovskite phase at RT, in a three-source co-sublimation method. We found that the MA⁺ incorporation is a self-limiting process, where the amount of MA⁺ which is incorporated in the perovskite is essentially unvaried with increasing MAI deposition rate. In this way a phase-pure, cubic perovskite with a bandgap of 1.53 eV can be obtained at room temperature. When used in fully vacuum-processed perovskite solar cells, PCEs up to 18.8% are obtained. Despite the presence of MA⁺, the solar cells were found to be thermally stable and maintained 90% of their initial efficiency after 1 month of continuous operation.

中文翻译：

具有稳定立方FA _{1– x} MA _x PbI _3的高效真空沉积钙钛矿太阳能电池

黑色甲ami碘化铅（FAPbI ₃）的制备需要高温退火，并需要引入较小的A位阳离子，例如甲基铵（MA ⁺），铯或rub。真空处理的主要优点是可以在室温（RT）下沉积钙钛矿薄膜，而无需任何退火步骤。在这里，我们用三源共升华方法论证了在室温下立方钙钛矿相的稳定化。我们发现MA ^+的掺入是一个自我限制的过程，其中MA ⁺的量钙钛矿中掺入的钙钛矿基本上不随MAI沉积速率的增加而变化。这样，在室温下可获得带隙为1.53 eV的纯相立方钙钛矿。当用于完全真空处理的钙钛矿太阳能电池中时，可获得高达18.8％的PCE。尽管存在MA ⁺，但发现太阳能电池是热稳定的，并且在连续运行1个月后仍保持其初始效率的90％。

更新日期：2020-09-11

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