Kwon Uisik, Kim Bong-Gi, Nguyen Duc Cuong, Park Jong-Hyeon, Ha Na Young, Kim Seung-Joo, Ko Seung Hwan, Lee Soonil, Lee Daeho, Park Hui Joon
Division of Energy Systems Research, Ajou University, Suwon 16499, Korea.
Department of Organic and Nano System Engineering, Konkuk University, Seoul 05029, Korea.
Sci Rep. 2016 Jul 28;6:30759. doi: 10.1038/srep30759.
In this work, we report on solution-based p-i-n-type planar-structured CH3NH3PbI3 perovskite photovoltaic (PV) cells, in which precrystallized NiO nanoparticles (NPs) without post-treatment are used to form a hole transport layer (HTL). X-ray diffraction and high-resolution transmission electron microscopy showed the crystallinity of the NPs, and atomic force microscopy and scanning electron microscopy confirmed the uniform surfaces of the resultant NiO thin film and the subsequent perovskite photoactive layer. Compared to the conventional poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (
PSS) HTL, the NiO HTL had excellent energy-level alignment with that of CH3NH3PbI3 and improved electron-blocking capability, as analyzed by photoelectron spectroscopy and diode modeling, resulting in Voc ~0.13 V higher than conventional
PSS-based devices. Consequently, a power conversion efficiency (PCE) of 15.4% with a high fill factor (FF, 0.74), short-circuit current density (Jsc, 20.2 mA·cm(-2)), and open circuit voltage (Voc, 1.04 V) having negligible hysteresis and superior air stability has been achieved.
在本工作中，我们报道了基于溶液的p-i-n型平面结构CH3NH3PbI3钙钛矿光伏（PV）电池，其中未经后处理的预结晶NiO纳米颗粒（NPs）用于形成空穴传输层（HTL）。X射线衍射和高分辨率透射电子显微镜显示了NPs的结晶度，原子力显微镜和扫描电子显微镜证实了所得NiO薄膜以及随后的钙钛矿光活性层表面的均匀性。与传统的聚（3,4-乙撑二氧噻吩）：聚（苯乙烯磺酸盐）（PEDOT：PSS）HTL相比，通过光电子能谱和二极管建模分析，NiO HTL与CH3NH3PbI3具有优异的能级匹配和改善的电子阻挡能力，导致开路电压（Voc）比传统的基于PEDOT：PSS的器件高约0.13 V。因此，实现了15.4%的功率转换效率（PCE），具有高填充因子（FF，0.74）、短路电流密度（Jsc，20.2 mA·cm(-2)）和开路电压（Voc，1.04 V），滞后可忽略不计且具有优异的空气稳定性。
