Light-induced reactivity of gold and hybrid perovskite as a new possible degradation mechanism in perovskite solar cells

Abstract

Gold degradation under UV-light through local formation of a reactive polyiodide melt and its rapid reaction with gold resulting in the MA2Au2I6 phase.

Effects of Iodine Doping on Carrier Behavior at the Interface of Perovskite Crystals: Efficiency and Stability

“…It can be seen that a split peak appeared close to 14.1 • once the iodine was doped into the HTL. The result was in accordance with the formation of MA 2 Au 2 I 6 , as we have mentioned [29]. Meanwhile, an additional peak emerged at 6.79 • after one week in air.…”

“…After one-week exposure in ambient air, PSCs with doped HTLs lost power generation ability, while PSCs with pure spiro-OMeTAD HTLs maintained stability in PCE. One reason [29] is that the I − diffused to the anode, leading to a light-induced reactivity of the gold iodide; a new possible degradation mechanism in PSCs. The formation of MA 2 Au 2 I 6 blocked charge extraction, and then the PCE was dramatically decreased after long-term exposure in air.…”

Understanding Hydrogen Bonding Interactions in Crosslinked Methylammonium Lead Iodide Crystals: Towards Reducing Moisture and Light Degradation Pathways

“…[4,41] 4CH 3 NH 3 PbI 3 ðsÞþ2H 2 OðlÞ!ðCH 3 NH 3 Þ 4 PbI 6 Á 2H 2 OðsÞþ3PbI 2 ðsÞ ð1Þ This hydrated perovskite phase then degrades to CH 3 NH 3 Ia nd PbI 2 ,w here CH 3 NH 3 Ii sf urther decomposed into CH 3 NH 2 ,a nd HI [Reactions (2) and (3)]. [4,42] (5)],u ltimately depleting CH 3 NH 3 Ia nd accelerating the degradation of the CH 3 NH 3 PbI 3 crystal via Reaction (4). [4,42] (5)],u ltimately depleting CH 3 NH 3 Ia nd accelerating the degradation of the CH 3 NH 3 PbI 3 crystal via Reaction (4).…”

“…[4][5][6][7][8] These approaches include modification of the perovskite structure via halide engineering, [9][10][11][12] cation substitution and the addition of dopants, [13][14][15][16][17] interface engineering, [18][19][20][21][22] and surface passivation [23] or encapsulation via small molecules or waterproof layers. [4][5][6][7][8] These approaches include modification of the perovskite structure via halide engineering, [9][10][11][12] cation substitution and the addition of dopants, [13][14][15][16][17] interface engineering, [18][19][20][21][22] and surface passivation [23] or encapsulation via small molecules or waterproof layers.…”

P‐Type SnO Thin Film Phototransistor with Perovskite‐Mediated Photogating

“…SnO films thicker than 15 nm can absorb more light, but it is difficult to keep the phase pure and to retain the good p-type transport character. [29][30][31] The perovskite layers coated on SnO and HfO 2 show similar morphology with well-defined grains (Figure 4b,c). A two-step sequential vapor conversion technique was used to prepare perovskite layers with smooth surfaces.…”