Hwang, Yoonjung Park, Bo-In Lee, Byung-Seok Kim, Jin Young Jeong, Jeung-Hyun Kim, Honggon Ko, Min Jae Kim, BongSoo Son, Hae Jung Lee, Seung Yong Lee, Jae-Seung Park, Jong-Ku Cho, So-Hye Lee, Doh-Kwon 2024-01-20T08:04:03Z 2024-01-20T08:04:03Z 2021-09-02 2014-12-04 1932-7447 https://pubs.kist.re.kr/handle/201004/126003 Kesterite Cu2ZnSnSe4 (CZTSe) thin films prepared by the selenization of mechanochemically synthesized Cu2ZnSnS4 (CZTS) nanocrystal films are systematically investigated as a function of the annealing time in terms of the phase purity, microstructure, composition, and device characteristics. It is shown that selenization for an extended time does not cause a noticeable amount of Sn loss or segregation of Zn-rich layers. Thus, the prolonged annealing leads to improvements (reduction) in the shunt conductance, reverse saturation current, and diode ideality factor. However, it also leads to a deterioration of the series resistance, of which influence turned out to overwhelm all of the aforementioned positive effects on the device performance. As a consequence, the CZTSe solar cell exhibits its highest efficiency (5.43%) at the shortest annealing time (10 min). Impedance spectroscopy is demonstrated to be of good use in detecting the change in the back contact of CZTSe solar cells during annealing. The impedance spectra of the CZTSe solar cells are analyzed in association with the microstructures of the back-contact electrodes, demonstrating that the increase in the series resistance is attributed to the formation of the resistive MoSe2 layer. English American Chemical Society THIN-FILMS FABRICATION PRECURSOR Influences of Extended Selenization on Cu2ZnSnSe4 Solar Cells Prepared from Quaternary Nanocrystal Ink Article 10.1021/jp508028t 1 The Journal of Physical Chemistry C, v.118, no.48, pp.27657 - 27663 The Journal of Physical Chemistry C 118 48 27657 27663 scie scopus 000345891900006 2-s2.0-84949135689 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Science & Technology - Other Topics Materials Science Article THIN-FILMS FABRICATION PRECURSOR CZTSe solar cell nanocrystals impedance MoSe2 annealing time