05 Fakultät Informatik, Elektrotechnik und Informationstechnik

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Publication Type: search.filters.UBSTyp.ZeitschriftenartikelStart date: 2020Subject: search.filters.subject.621.3Author: search.filters.author.Abate, Antonio

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    High‐stable lead‐free solar cells achieved by surface reconstruction of quasi‐2D tin‐based perovskites
    (2023) Yang, Feng; Zhu, Rui; Zhang, Zuhong; Su, Zhenhuang; Zuo, Weiwei; He, Bingchen; Aldamasy, Mahmoud Hussein; Jia, Yu; Li, Guixiang; Gao, Xingyu; Li, Zhe; Saliba, Michael; Abate, Antonio; Li, Meng
    Tin halide perovskites are an appealing alternative to lead perovskites. However, owing to the lower redox potential of Sn(II)/Sn(IV), particularly under the presence of oxygen and water, the accumulation of Sn(IV) at the surface layer will negatively impact the device's performance and stability. To this end, this work has introduced a novel multifunctional molecule, 1,4‐phenyldimethylammonium dibromide diamine (phDMADBr), to form a protective layer on the surface of Sn‐based perovskite films. Strong interactions between phDMADBr and the perovskite surface improve electron transfer, passivating uncoordinated Sn(II), and fortify against water and oxygen. In situ grazing incidence wide‐angle X‐ray scattering (GIWAXS) analysis confirms the enhanced thermal stability of the quasi‐2D phase, and hence the overall enhanced stability of the perovskite. Long‐term stability in devices is achieved, retaining over 90% of the original efficiency for more than 200 hours in a 10% RH moisture N2 environment. These findings propose a new approach to enhance the operational stability of Sn‐based perovskite devices, offering a strategy in advancing lead‐free optoelectronic applications.
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    Co‐doping approach for enhanced electron extraction to TiO2 for stable inorganic perovskite solar cells
    (2025) Gries, Thomas W.; Regaldo, Davide; Köbler, Hans; Putri Hartono, Noor Titan; Harvey, Steven P.; Simmonds, Maxim; Frasca, Chiara; Härtel, Marlene; Sannino, Gennaro V.; Félix, Roberto; Hüsam, Elif; Saleh, Ahmed; Wilks, Regan G.; Zu, Fengshuo; Gutierrez‐Partida, Emilio; Iqbal, Zafar; Loghman Nia, Zahra; Yang, Fengjiu; Delli Veneri, Paola; Zhu, Kai; Stolterfoht, Martin; Bär, Marcus; Weber, Stefan A.; Schulz, Philip; Puel, Jean‐Baptiste; Kleider, Jean‐Paul; Unger, Eva; Wang, Qiong; Musiienko, Artem; Abate, Antonio
    Inorganic perovskite CsPbI3 solar cells hold great potential for improving the operational stability of perovskite photovoltaics. However, electron extraction is limited by the low conductivity of TiO2, representing a bottleneck for achieving stable performance. In this study, a co‐doping strategy for TiO2 using Nb(V) and Sn(IV), which reduces the material's work function by 80 meV compared to Nb(V) mono‐doped TiO2, is introduced. To gain fundamental understanding of the processes at the interfaces between the perovskite and charge‐selective layer, transient surface photovoltage measurements are applied, revealing the beneficial effect of the energetic and structural modification on electron extraction across the CsPbI3/TiO2 interface. Using 2D drift‐diffusion simulations, it is found that co‐doping reduces the interface hole recombination velocity by two orders of magnitude, increasing the concentration of extracted electrons by 20%. When integrated into n-i-p solar cells, co‐doped TiO2 enhances the projected TS80 lifetimes under continuous AM1.5G illumination by a factor of 25 compared to mono‐doped TiO2. This study provides fundamental insights into interfacial charge extraction and its correlation with operational stability of perovskite solar cells, offering potential applications for other charge‐selective contacts.