<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Cheng-YingChen</style></author><author><style face="normal" font="default" size="100%">Bandiyah Sri Aprillia</style></author><author><style face="normal" font="default" size="100%">Wei-ChaoChen</style></author><author><style face="normal" font="default" size="100%">Yen-Ching Teng</style></author><author><style face="normal" font="default" size="100%">Chih-Yuan Chiu</style></author><author><style face="normal" font="default" size="100%">Ruei-San Chen</style></author><author><style face="normal" font="default" size="100%">Jih-Shang Hwang</style></author><author><style face="normal" font="default" size="100%">Kuei-Hsien Chen</style></author><author><style face="normal" font="default" size="100%">Li-Chyong Chen</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Above 10% Efficiency Earth-abundant Cu2ZnSn(S,Se)4 Solar Cells by Introducing Alkali Metal Fluoride Nanolayers as Electron-selective Contacts</style></title><secondary-title><style face="normal" font="default" size="100%">Nano Energy</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Solar cells</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2018</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.sciencedirect.com/science/article/pii/S2211285518304233</style></url></web-urls></urls><pages><style face="normal" font="default" size="100%">-</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Abstract The present investigation mainly addresses the open circuit voltage (Voc) issue in kesterites based Cu2ZnSn(S,Se)4 solar cells by simply introducing alkali metal fluoride nanolayers (  several nm NaF, or LiF) to lower the work functions of the front İTO\} contacts without conventional hole-blocking ZnO layers. Kelvin probe measurements confirmed that the work function of the front İTO\} decreases from 4.82 to 3.39 and 3.65 eV for NaF and LiF, respectively, resulting in beneficial band alignment for electron collection and/or hole blocking on top electrodes. Moreover, a 10.4% power conversion efficiency ( 11.5% in the cell effective area) \{CZTSSe\} cell with improved Voc of up to 90 mV has been attained. This demonstration may provide a new direction of further boosting the performance of copper chalcogenide based solar cells as well.&lt;/p&gt;
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