摘要
在钙钛矿太阳电池的制作过程中,通过改善旋涂方法和条件,可大大提高钙钛矿吸收层的结晶性以及太阳电池的光电转换性能。与常规的一次性旋涂方法相比,采用连续二次旋涂方法制作的钙钛矿薄膜更加致密,结晶性明显提高。旋涂时前驱液和衬底的温度会影响钙钛矿层的晶体结构,温度为60℃时,钙钛矿的平均晶粒尺寸约为500 nm,且晶粒之间致密排列,导致光学带隙增加。采用连续二次旋涂方法,在加热温度为60℃时制作的钙钛矿太阳电池的光电转换效率达到14.7%,其中短路电流密度、开路电压和填充因子分别为18.9 mA/cm^2、1.13 V和69%。与常规钙钛矿太阳电池相比,开路电压提高约100 mV。依据暗态J-V测试结果,二次旋涂工艺条件下,该光伏器件的反向饱和电流密度约为10^-5m A/cm^2,比一次旋涂工艺降低3个数量级。
Through changing spin-coating method and conditions in the fabrication process of perovskite solar cell,thecrystallinity of perovskite absorbing layer and the PV conversion performances of solar cell can be greatly improved.Compared with conventional once spin-coating method,the perovskite film produced by the successive twice spin coatingmethod is denser and the crystallinity is significantly improved. The temperature of precursor fluid and substrate willaffect crystalline structure of perovskite layer during spin-coating,when heating temperature is 60℃,the average crystalgrain size of perovskite is approximately 500 nm,and the dense arrangement between the crystal grains results in theincrease of optical bandgap. By applying the successive twice spin coating method,the conversion efficiency ofperovskite solar cell fabricated in heating temperature of 60 ℃ reaches to 14.7%,short circuit current density,opencircuit voltage and fill factor are 18.9 mA/cm^2,1.13 V and 0.69,respectively. Compared with conventional perovskitesolar cell,open circuit voltage is improved by 100 mV. According to the dark state J-V test results,under the twice spincoating condition,the reverse saturation current density J0 of the PV device is about 10^-5 mA/cm^2,which is about 3 orders of magnitudes lower than perovskite solar cells fabricated by conventional once spin-coating process.
作者
张鑫亮
马忠权
刘正新
Zhang Xinliang;Ma Zhongquan;Liu Zhengxin(SHU-Solar E R＆D Lab, Department of Physics, College of Sciences, Shanghai University, Shanghai 200444, China;Research Center for New Energy Technology, Shanghai Institute of Microsystem and Information Technology （ SIMIT） , Chinese Academy of Sciences （CAS）, Shanghai 201800, China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2018年第6期1588-1594,共7页
Acta Energiae Solaris Sinica
基金
国家自然科学基金(61274067)
2012年度上海市重大技术装备研制专项(太阳电池标准测试平台项目)
上海张江国家自主创新示范区专项发展资金重大项目(ZJ2015-ZD-001)
关键词
钙钛矿太阳电池
二次旋涂
结晶性
光学带隙
反向饱和电流密度
perovskite solar cell
twice spin coating
crystallinity
optical band gap
reverse saturation current density
