Ginting, Riski Titian Jeon, Mi-Kyoung Lee, Kwang-Jae Jin, Won-Yong Kim, Tae-Wook Kang, Jae-Wook 2024-01-20T02:01:41Z 2024-01-20T02:01:41Z 2021-09-01 2017-03-07 2050-7488 https://pubs.kist.re.kr/handle/201004/122957 In this report, we demonstrate that moisture/O-2 in ambient air is the major issue for the photovoltaic performance degradation and severe photocurrent hysteresis of non-encapsulated planar-perovskite solar cells. Consequently, this leads to difficulty in determining the real power conversion efficiency (PCE). Upon longer storage time, the evidence of a small amount of iodine in the hole transport layer (HTL) led to hindering the charge transport from the HTL to the anode, thus resulting in the decrease of short-circuit current density and fill factor. Meanwhile, the transient chronoamperometry result suggests that the increase of hysteresis with storage time is ascribed to the changes of activation energy. It is further supported by X-ray photoelectron spectroscopy depth profile analysis, which revealed that penetration of moisture/O-2 caused the shifts of iodine distribution within the perovskite layer after aging time of >72 h. Remarkably, effective moisture/O-2 passivation can be achieved by combination of polyimide and UV-cured polymer as a novel encapsulation process, which exhibited an impressive stabilized PCE of above 14% (retained 97% of its initial efficiency) and simultaneously maintained the hysteresis up to similar to 1000 h. English ROYAL SOC CHEMISTRY LEAD IODIDE THIN-FILMS ANOMALOUS HYSTERESIS SELECTIVE CONTACTS HIGHLY EFFICIENT HIGH-PERFORMANCE SPIRO-MEOTAD STABILITY TEMPERATURES INSTABILITY Degradation mechanism of planar-perovskite solar cells: correlating evolution of iodine distribution and photocurrent hysteresis Article 10.1039/c6ta09202k 1 JOURNAL OF MATERIALS CHEMISTRY A, v.5, no.9, pp.4527 - 4534 JOURNAL OF MATERIALS CHEMISTRY A 5 9 4527 4534 scie scopus 000395926100030 2-s2.0-85014220489 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article LEAD IODIDE THIN-FILMS ANOMALOUS HYSTERESIS SELECTIVE CONTACTS HIGHLY EFFICIENT HIGH-PERFORMANCE SPIRO-MEOTAD STABILITY TEMPERATURES INSTABILITY planar-perovskite solar cells