@article { ISI:000352246700007,
	title = {Improved Hole-Transporting Property via HAT-CN for Perovskite Solar Cells without Lithium Salts},
	journal = {ACS APPLIED MATERIALS \& INTERFACES},
	volume = {7},
	number = {12},
	year = {2015},
	month = {APR 1},
	pages = {6406-6411},
	abstract = {A nonadditive hole-transporting material (HTM) of a triphenylamine derivative of N,N{\textquoteright}-di(3-methylphenyl)-N,N{\textquoteright}-diphenyl-4,4{\textquoteright}-diaminobiphenyl (TPD) is used for the organic-inorganic hybrid perovskite solar cells. The power conversion efficiency (PCE) can be significantly enhanced by inserting a thin layer of 1,4,5,8,9,11-hexaazatriphenylenehexacarbonitrile (HAT-CN) without adding an ion additive because the hole-transporting properties improve. The short-circuit current density (J(sc)) increases from 8.5 to 13.1 mA/cm(2), the open-circuit voltage (V-oc) increases from 0.84 to 0.92 V, and the fill-factor (FF) increases from 0.45 to 0.59, which corresponds to the increase in PCE from 3.2\% to 7.1\%. Moreover, the PCE decreases by only 10\% after approximately 1000 h without encapsulation, which suggests an alternative method to improve the stability of perovskite solar cells.},
	issn = {1944-8244},
	doi = {10.1021/acsami.5b00149},
	author = {Ma, Yingzhuang and Chung, Yao-Hsien and Zheng, Lingling and Zhang, Danfei and Xiao Yu and Xiao, Lixin and Chen, Zhijian and Wang, Shufeng and Qu, Bo and Qihuang Gong and Zou, Dechun}
}
