Journal
CHEMSUSCHEM
Volume 13, Issue 16, Pages 4051-4063Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202000501
Keywords
chemical bath deposition; perovskites; photovoltaics; surface chemistry; tin
Funding
- Korea Atomic Energy Research Institute (KAERI)
- Korea government [KETEP- 20193091010240, NRF-2015M1A2A2056829, 2017M1A2A2087351]
- National Research Council of Science & Technology (NST), Republic of Korea [523260-20] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Planar perovskite solar cells (PSCs) incorporating n-type SnO(2)have attracted significant interest because of their excellent photovoltaic performance. However, the film fabrication of SnO(2)is limited by self-aggregation and inhomogeneous growth of the intermediate phase, which produces poor morphology and properties. In this study, a self-controlled SnO(2)layer is fabricated directly on a fluorine-doped tin oxide (FTO) surface through simple and rapid chemical bath deposition. The PSCs based on this hydrolyzed SnO(2)layer exhibit an excellent power conversion efficiency of 20.21 % with negligible hysteresis. Analysis of the electrochemical impedance spectroscopy on the charge transport dynamics indicates that the bias voltage influences both interfacial charge transportation and the ionic double layer under illumination. The hydrolyzed SnO2-based PSCs demonstrate a faster ionic charge response time of 2.5 ms in comparison with 100.5 ms for the hydrolyzed TiO2-based hysteretic PSCs. The results of quasi-steady-state carrier transportation indicate that a dynamic hysteresis in theJ-Vcurves can be explained by complex ionic-electronic kinetics owing to the slow ionic charge redistribution and hole accumulation caused by electrode polarization, which causes an increase in charge recombination. This study reveals that SnO2-based PSCs lead to a stabilized dark depolarization process compared with TiO2-based PSCs, which is relevant to the charge transport dynamics in the high-performing planar SnO2-based PSCs.
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