@article { ISI:000402708700004,
	title = {An ammonia modified PEDOT: PSS for interfacial engineering in inverted planar perovskite solar cells},
	journal = {ORGANIC ELECTRONICS},
	volume = {46},
	year = {2017},
	month = {JUL},
	pages = {22-27},
	abstract = {Poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) (PEDOT:PSS) is one of the most widely used hole transport layers (HTL) in inverted perovskite solar cells (PSCs) due to its simple solution-processed ability, high transparency, and conductivity. However, PEDOT: PSS-based devices suffer a lower open-circuit voltage (V-oc) than devices with the conventional structure. To address this issue, we fabricated ammonia-modified PEDOT: PSS films by simply doping PEDOT: PSS solution with different ratio of ammonia. The acidity of PEDOT: PSS can be neutralized by the doped ammonia, which inhibits the ion-exchange reaction between PSS-H and CH3NH3I, thus retarding the reduction of the work function for PEDOT: PSS to some extent. As a result, a superior power conversion efficiency (PCE) of 15.5\% was obtained for the device based on the ammonia-doped PEDOT: PSS HTL than that of the pristine PEDOT: PSS-based device. We ascribe the PCE enhancement to the increased Voc and fill factor (FF), which is attributed not only to the better energy-level alignment between the ammonia-modified PEDOT: PSS film and perovskite layer but also to the increased grain size and crystallinity of perovskite film. (C) 2017 Published by Elsevier B.V.},
	issn = {1566-1199},
	doi = {10.1016/j.orgel.2017.03.019},
	author = {Sun, Weihai and Li, Yunlong and Yan Xiao and Zhao, Ziran and Ye, Senyun and Rao, Haixia and Ting, Hungkit and Bian, Zuqiang and Xiao, Lixin and Huang, Chunhui and Chen, Zhijian}
}
