Novel Molecular Doping Mechanism for n‐Doping of SnO2 via Triphenylphosphine Oxide and Its Effect on Perovskite Solar Cells |
| |
Authors: | Bao Tu,Yangfan Shao,Wei Chen,Yinghui Wu,Xin Li,Yanling He,Jiaxing Li,Fangzhou Liu,Zheng Zhang,Yi Lin,Xiaoqi Lan,Leiming Xu,Xingqiang Shi,Alan Man Ching Ng,Haifeng Li,Lung Wa Chung,Aleksandra B. Djuri i ,Zhubing He |
| |
Affiliation: | Bao Tu,Yangfan Shao,Wei Chen,Yinghui Wu,Xin Li,Yanling He,Jiaxing Li,Fangzhou Liu,Zheng Zhang,Yi Lin,Xiaoqi Lan,Leiming Xu,Xingqiang Shi,Alan Man Ching Ng,Haifeng Li,Lung Wa Chung,Aleksandra B. Djurišić,Zhubing He |
| |
Abstract: | Molecular doping of inorganic semiconductors is a rising topic in the field of organic/inorganic hybrid electronics. However, it is difficult to find dopant molecules which simultaneously exhibit strong reducibility and stability in ambient atmosphere, which are needed for n‐type doping of oxide semiconductors. Herein, successful n‐type doping of SnO2 is demonstrated by a simple, air‐robust, and cost‐effective triphenylphosphine oxide molecule. Strikingly, it is discovered that electrons are transferred from the R3P+? O?σ‐bond to the peripheral tin atoms other than the directly interacted ones at the surface. That means those electrons are delocalized. The course is verified by multi‐photophysical characterizations. This doping effect accounts for the enhancement of conductivity and the decline of work function of SnO2, which enlarges the built‐in field from 0.01 to 0.07 eV and decreases the energy barrier from 0.55 to 0.39 eV at the SnO2/perovskite interface enabling an increase in the conversion efficiency of perovskite solar cells from 19.01% to 20.69%. |
| |
Keywords: | delocalized electrons molecular doping n‐type perovskite solar cells SnO2 |
|
|