Polyurethane-Encapsulated Mesoporous Carbon-Based Perovskite Solar Cells Resilient to Extreme Humidity and Mitigation of the Related Reversible J–V Bump

IF 5.4 3区 材料科学 Q2 CHEMISTRY, PHYSICAL
Salvatore Valastro, Gaetano Calogero, Emanuele Smecca, Valentina Arena, Giovanni Mannino, Corrado Bongiorno, Ioannis Deretzis, Giuseppe Fisicaro, Antonino La Magna, Simone Galliano*, Gabriele Viada, Matteo Bonomo, Claudia Barolo and Alessandra Alberti*, 
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引用次数: 0

Abstract

Mesoporous carbon-based (mC) hole-transporting layer-free architectures offer a cost-effective solution for the commercialization of perovskite solar cells (PSCs). Adding 5-aminovaleric acid (AVA) to MAPbI3 reduces defect concentration and enhances pore filling, while Eu enrichment in CsPbI3 reduces cation migration and enables device reusability. In this study, AVA-MAPbI3 mC-PSCs were encapsulated at room temperature (RT) with a solvent- and water-free polyurethane (PU) resin. Under continuous ambient light, RT, and 40% relative humidity (RH), the PU encapsulant acts as a barrier to extend device durability and enable reusability. The formation of a bump in the JV curve after ∼250 h, already reported at a low scan rate but here observed at 50 mV/s, strongly reduces the photovoltaic performances. We demonstrate that the bump is not linked to the formation of PbI2 but is explained by a water-vacancy interaction that increases cation mobility and enhances screening effects near the electron-transport layer. The photovoltaic performances are fully restored by drying the devices under N2 flow for ∼48 h. A further addition of a hydrophobic Kapton tape interlayer between the PU and device mitigates bump formation, boosts t90 to ∼6000 h, and projects t80 to ∼10,800 h. Differently from the Kapton tape used alone, PU provides effective sealing all around the devices, ensuring stability in 100% RH at 90 °C and even underwater. For indoor applications, Eu:CsPbI3 mC-PSCs typically degrade from the γ- to δ-phase within ∼1 h in air, whereas PU-encapsulated devices achieve t80 ∼250 h, extendable to 1250 h with an additional closure glass slide.

Abstract Image

聚氨酯包封的介孔碳基钙钛矿太阳能电池对极端湿度的弹性和相关可逆J-V颠簸的缓解
介孔碳基(mC)空穴传输无层结构为钙钛矿太阳能电池(PSCs)的商业化提供了一种经济有效的解决方案。在MAPbI3中添加5-氨基戊酸(AVA)可以降低缺陷浓度,增强孔隙填充,而在CsPbI3中富集Eu可以减少阳离子迁移,提高设备的可重用性。在本研究中,AVA-MAPbI3 mc - psc在室温(RT)下用无溶剂和无水的聚氨酯(PU)树脂包封。在持续的环境光、RT和40%相对湿度(RH)下,PU封装剂可以作为延长设备耐用性和可重复使用的屏障。在~ 250 h后,在J-V曲线上形成一个凸起,已经在低扫描速率下报道,但在50 mV/s下观察到,强烈降低了光伏性能。我们证明了这种突起与PbI2的形成无关,但可以用水-空位相互作用来解释,这种相互作用增加了阳离子的迁移率,增强了电子传输层附近的筛选效应。通过在N2流下干燥设备约48小时,光伏性能完全恢复。在PU和设备之间进一步添加疏水性卡普顿胶带夹层,可减轻碰撞形成,将t90延长至~ 6000小时,并将t80延长至~ 10800小时。与单独使用卡普顿胶带不同,PU可有效密封设备周围,确保在90°C下100%相对湿度下的稳定性,甚至在水下。对于室内应用,Eu:CsPbI3 mc - psc通常在空气中约1小时内从γ-相降解到δ-相,而pu封装的设备可达到t80 ~ 250小时,通过额外的封闭玻璃载玻片可扩展到1250小时。
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来源期刊
ACS Applied Energy Materials
ACS Applied Energy Materials Materials Science-Materials Chemistry
CiteScore
10.30
自引率
6.20%
发文量
1368
期刊介绍: ACS Applied Energy Materials is an interdisciplinary journal publishing original research covering all aspects of materials, engineering, chemistry, physics and biology relevant to energy conversion and storage. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials, engineering, physics, bioscience, and chemistry into important energy applications.
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