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Electrochemical and atomic force microscopy investigations of the effect of CdS on the local electrical properties of CH3NH3PbI3:CdS perovskite solar cells
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-11-06 00:00:00 , DOI: 10.1039/c7tc04377e Mingxuan Guo 1, 2, 3, 4, 5 , Fumin Li 1, 2, 3, 4, 5 , Lanyu Ling 1, 2, 3, 4, 5 , Chong Chen 1, 2, 3, 4, 5
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-11-06 00:00:00 , DOI: 10.1039/c7tc04377e Mingxuan Guo 1, 2, 3, 4, 5 , Fumin Li 1, 2, 3, 4, 5 , Lanyu Ling 1, 2, 3, 4, 5 , Chong Chen 1, 2, 3, 4, 5
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The effects of the incorporated CdS on the local optoelectronic properties of CH3NH3PbI3:CdS bulk heterojunction (BHJ) perovskite solar cells (PSCs) are studied using Kelvin probe force microscopy (KPFM), conductive atomic force microscopy (c-AFM) and electrochemical impedance spectroscopy (EIS). The KPFM and c-AFM results clearly show that as the amount of incorporated CdS increases, the incorporated CdS creates more uniform and compact perovskite films. Moreover, the incorporated CdS nanoparticles lead to a higher surface potential and a more uniform and higher photocurrent distribution on the CH3NH3PbI3:CdS active layer, which indicates that the CdS nanoparticles can lead to more effective photo-generated electron transfer from the CH3NH3PbI3 to the CdS and proves experimentally that the CdS nanoparticles can form a continuous photo-generated electron transport channel. The EIS results show that the CdS can effectively decrease the contact resistances at the active layer/electron transport layer and the active layer/hole transport layer interfaces and it helps in the charge collection of the cells, which further confirms that the CdS nanoparticles can play the role of transporting electrons. Our study provides a nanoscale understanding of the improved device performance of CH3NH3PbI3:CdS PSCs.
中文翻译：
电化学和原子力显微镜研究CdS对CH 3 NH 3 PbI 3：CdS钙钛矿太阳能电池局部电性能的影响
使用开尔文探针力显微镜（KPFM），导电原子力显微镜（c-AFM）研究了掺入的CdS对CH 3 NH 3 PbI 3：CdS体异质结（BHJ）钙钛矿型太阳能电池（PSC）的局部光电性能的影响。）和电化学阻抗谱（EIS）。KPFM和c-AFM结果清楚地表明，随着CdS掺入量的增加，掺入的CdS会产生更均匀，致密的钙钛矿薄膜。而且，掺入的CdS纳米颗粒导致在CH 3 NH 3 PbI 3上具有更高的表面电势和更均匀且更高的光电流分布。:: CdS活性层，表明CdS纳米粒子可以导致更有效的光生电子从CH 3 NH 3 PbI 3转移到CdS，并实验证明CdS纳米粒子可以形成连续的光生电子传输通道。EIS结果表明，CdS可以有效降低活性层/电子传输层与活性层/空穴传输层界面的接触电阻，有助于细胞的电荷收集，进一步证实了CdS纳米粒子可以发挥作用传输电子的作用。我们的研究提供了对CH 3 NH 3 PbI 3改善的器件性能的纳米尺度的理解。：CdS PSC。
更新日期：2017-11-16
中文翻译：
电化学和原子力显微镜研究CdS对CH 3 NH 3 PbI 3：CdS钙钛矿太阳能电池局部电性能的影响
使用开尔文探针力显微镜（KPFM），导电原子力显微镜（c-AFM）研究了掺入的CdS对CH 3 NH 3 PbI 3：CdS体异质结（BHJ）钙钛矿型太阳能电池（PSC）的局部光电性能的影响。）和电化学阻抗谱（EIS）。KPFM和c-AFM结果清楚地表明，随着CdS掺入量的增加，掺入的CdS会产生更均匀，致密的钙钛矿薄膜。而且，掺入的CdS纳米颗粒导致在CH 3 NH 3 PbI 3上具有更高的表面电势和更均匀且更高的光电流分布。:: CdS活性层，表明CdS纳米粒子可以导致更有效的光生电子从CH 3 NH 3 PbI 3转移到CdS，并实验证明CdS纳米粒子可以形成连续的光生电子传输通道。EIS结果表明，CdS可以有效降低活性层/电子传输层与活性层/空穴传输层界面的接触电阻，有助于细胞的电荷收集，进一步证实了CdS纳米粒子可以发挥作用传输电子的作用。我们的研究提供了对CH 3 NH 3 PbI 3改善的器件性能的纳米尺度的理解。：CdS PSC。
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