基于旋涂-蒸发两步法的CsPbBr_(3)钙钛矿太阳能电池

CsPbBr_(3) perovskite solar cells based on spin-evaporation two-step method

介绍了一种应用于CsPbBr3钙钛矿太阳能电池的旋涂-蒸发两步法工艺,用一步蒸发的方法取代了传统的多步旋涂法,精确地控制了CsBr的厚度,提高了器件的重复性;当CsBr的厚度优化到260 nm时,可以得到纯CsPbBr3钙钛矿.分析了退火温度对钙钛矿薄膜结晶度的影响,结果表明:在350℃下可以得到高质量的钙钛矿薄膜,最优钙钛矿太阳能电池器件的光电转换效率为7.2%,开路电压为1.27 V,短路电流为7.55 mA/cm2,填充因子为0.752;此外,所制备的CsPbBr3钙钛矿薄膜在光电探测器应用方面也表现优异,在空气环境下表现出良好的稳定性.

A novel hybrid spin-evaporation deposition method was demonstrated for the CsPbBr_(3) perovskite solar cells.The thickness of CsBr was accurately controlled by one-step evaporation instead of the traditional multi-step spin-coating method,which effectively improved the repeatability of devices.When the thickness of CsBr was optimized to 260 nm,pure CsPbBr_(3) perovskite was obtained.The effect of annealing temperature on the crystallinity of perovskite films was also studied.It is found that high quality perovskite films could be obtained at 350℃.The champion perovskite solar cell achieves a power conversion efficiency of 7.2%,an open circuit voltage of 1.27 V,a short circuit current of 7.55 mA/cm^(2) and a fill factor of 0.752.In addition,the as-prepared CsPbBr_(3) is proved to be an excellent candidate for the application in perovskite photodetectors,which exhibits good stability in air condition.