title: Improved hole-transporting property via HAT-CN for perovskite solar cells without lithium salts.
abstract: A nonadditive hole-transporting material (HTM) of a triphenylamine derivative of N,N'-di(3-methylphenyl)-N,N'-diphenyl-4,4'-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.
authors.forename: Yingzhuang
authors.initials: Y
authors.lastname: Ma
authors.forename: Yao-Hsien
authors.initials: YH
authors.lastname: Chung
authors.forename: Lingling
authors.initials: L
authors.lastname: Zheng
authors.forename: Danfei
authors.initials: D
authors.lastname: Zhang
authors.forename: Xiao
authors.initials: X
authors.lastname: Yu
authors.affiliation: §New Display Device and System Integration Collaborative Innovation Center of the West Coast of the Taiwan Strait, Fuzhou 350002, People's Republic of China.
authors.forename: Lixin
authors.initials: L
authors.lastname: Xiao
authors.affiliation: §New Display Device and System Integration Collaborative Innovation Center of the West Coast of the Taiwan Strait, Fuzhou 350002, People's Republic of China.
authors.forename: Zhijian
authors.initials: Z
authors.lastname: Chen
authors.affiliation: §New Display Device and System Integration Collaborative Innovation Center of the West Coast of the Taiwan Strait, Fuzhou 350002, People's Republic of China.
authors.forename: Shufeng
authors.initials: S
authors.lastname: Wang
authors.affiliation: §New Display Device and System Integration Collaborative Innovation Center of the West Coast of the Taiwan Strait, Fuzhou 350002, People's Republic of China.
authors.forename: Bo
authors.initials: B
authors.lastname: Qu
authors.forename: Qihuang
authors.initials: Q
authors.lastname: Gong
authors.forename: Dechun
authors.initials: D
authors.lastname: Zou
keywords: HAT-CN; hole-transport; interfacial; perovskite solar cell; stability