Fundamental Study on the Fabrication of Inverted Planar Perovskite Solar Cells Using Two-Step Sequential Substrate Vibration-Assisted Spray Coating (2S-SVASC).
Fundamental Study on the Fabrication of Inverted Planar Perovskite Solar Cells Using Two-Step Sequential Substrate Vibration-Assisted Spray Coating (2S-SVASC).
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DOI：
10.1186/s11671-016-1259-2
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发表时间：
2016-12
影响因子：
--
通讯作者：
Eslamian M
中科院分区：
文献类型：
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作者：
Zabihi F;Ahmadian-Yazdi MR;Eslamian M
本文开发了一种可扩展的快速制备倒平面异质结太阳能电池（FTO/PEDOT:PSS/CH3NH3PbI3−xClx/PCBM/Al）中钙钛矿光收集层的工艺。钙钛矿前驱体溶液通过本文所称的两步顺序衬底振动辅助喷涂（2S-SVASC），分两个连续步骤喷涂到超声振动衬底上。施加在衬底上的温和超声振动促进了钙钛矿纳米晶体的扩散和聚并、表面润湿、蒸发、试剂混合和均匀生长。研究了衬底温度、衬底振动强度和两次连续喷涂的时间间隔对钙钛矿薄膜的粗糙度、覆盖度和晶体结构的影响。我们证明了前驱体溶液喷涂间隔时间长（15分钟）、衬底温度高（120°C）和衬底振动功率低（5 W）的组合可以产生良好的形貌和表面质量。比较了通过2S-SVASC技术制备的钙钛矿薄膜与共喷涂的钙钛矿薄膜的特性和性能。采用可扩展2S-SVASC技术制作的器件在0.3 cm2有源面积上的最大功率转换效率为5.08%。
In this paper, a scalable and fast process is developed and employed for the fabrication of the perovskite light harvesting layer in inverted planar heterojunction solar cell (FTO/PEDOT:PSS/CH3NH3PbI3−xClx/PCBM/Al). Perovskite precursor solutions are sprayed onto an ultrasonically vibrating substrate in two sequential steps via a process herein termed as the two-step sequential substrate vibration-assisted spray coating (2S-SVASC). The gentle imposed ultrasonic vibration on the substrate promotes droplet spreading and coalescence, surface wetting, evaporation, mixing of reagents, and uniform growth of perovskite nanocrystals. The role of the substrate temperature, substrate vibration intensity, and the time interval between the two sequential sprays are studied on the roughness, coverage, and crystalline structure of perovskite thin films. We demonstrate that a combination of a long time interval between spraying of precursor solutions (15 min), a high substrate temperature (120 °C), and a mild substrate vibration power (5 W) results in a favorable morphology and surface quality. The characteristics and performance of prepared perovskite thin films made via the 2S-SVASC technique are compared with those of the co-sprayed perovskite thin films. The maximum power conversion efficiency of 5.08 % on a 0.3-cm2 active area is obtained for the device made via the scalable 2S-SVASC technique.