Mirco- and Nano-technology Research Center, State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27606, USA.
Small. 2016 Dec;12(46):6346-6352. doi: 10.1002/smll.201601974. Epub 2016 Sep 27.
Organometallic halide perovskites solar cells are fabricated on nano-scaled corrugated substrates using a sequential deposition method. The corrugated substrates are fabricated using colloidal lithography followed by reactive ion etching. The corrugated structure is found to accelerate the chemical reaction between the sequentially deposited lead iodide (PbI ) and methyl ammonium iodide layers to form stoichiometric perovskite films, and the corrugated morphology is preserved at the interface of the hole transport layer (HTL) and the perovskite layer. The shunt resistance of the corrugated devices is found to be higher than that of the planar devices, leading to a higher open circuit voltage (V ) and fill factor (FF) in the corrugated devices. Finite-difference time-domain simulation is carried out on both planar and corrugated devices. The results revealed that light absorption is enhanced in the corrugated devices due to the corrugated HTL/perovskite interface, resulting in a significantly higher short circuit current (J ) observed in the corrugated devices. As a result, the average power conversion efficiency increases from 8.7% for the planar devices to 13% for the corrugated devices.
采用顺序沉积法在纳米级波纹状衬底上制备了金属卤化物钙钛矿太阳能电池。通过胶体光刻和反应离子刻蚀来制备波纹状衬底。研究发现，波纹结构可以加速顺序沉积的碘化铅（PbI ）和甲脒碘化盐层之间的化学反应，形成化学计量比的钙钛矿薄膜，并且波纹形态在空穴传输层（HTL）和钙钛矿层的界面处得以保留。波纹器件的并联电阻被发现高于平面器件，从而导致波纹器件的开路电压（V ）和填充因子（FF）更高。对平面和波纹器件都进行了有限差分时间域模拟。结果表明，由于波纹 HTL/钙钛矿界面，波纹器件中的光吸收增强，导致在波纹器件中观察到的短路电流（J ）显著增加。因此，平均功率转换效率从平面器件的 8.7%提高到了波纹器件的 13%。
