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Your search keyword '"Djurišić, Aleksandra B."' showing total 196 results
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16. Substrate Modifications for Stability Improvements of Flexible Perovskite Solar Cells.

Author

Lin, Jingyang, He, Yanling, Mo, Hongbo, Khaleed, Abdul, Ren, Zhilin, Li, Yin, Cao, Yingnan, Tang, Jinyao, Wang, Wei‐Ting, Feng, Shien‐Ping, Sun, Zhao, Li, Wen‐Di, Zhu, Tao, Li, Gang, Ng, Alan Man Ching, and Djurišić, Aleksandra B.

Subjects
SOLAR cells, ATOMIC layer deposition, PEROVSKITE, PHOTOVOLTAIC power systems, OXYGEN reduction
Abstract

Flexible perovskite solar cells (fPSCs) prepared on flexible plastic substrates exhibit poor stability under illumination in ambient, due to inferior gas barrier properties of plastic substrates. Herein, we investigated effect of different modifications of the back surface of the substrate to improve stability under illumination in ambient. T80 under simulated solar illumination at maximum power point in ambient (ISOS‐L‐1) can be increased from 80 h to over 350 h with the deposition of a single layer (by spin‐coating or by atomic layer deposition (ALD)). While ALD layers resulted in the best T80 value and significant reduction of the oxygen transmission rate compared to other modifications even for very low film thickness (≈10 nm), a simple solution‐processed spin‐on‐glass barrier layer also enables significant (more than 4 times) improvement in device stability. This work illustrates the importance of barrier layers for decreasing the ingress of oxygen and moisture into fPSCs through the plastic substrate. [ABSTRACT FROM AUTHOR]

Published
2024
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17. Perovskite–organic tandem solar cells.

Author

Brinkmann, Kai O., Wang, Pang, Lang, Felix, Li, Wei, Guo, Xiao, Zimmermann, Florian, Olthof, Selina, Neher, Dieter, Hou, Yi, Stolterfoht, Martin, Wang, Tao, Djurišić, Aleksandra B., and Riedl, Thomas

Published
2024
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19. Effect of the hole transport layer on the performance of sky-blue Dion–Jacobson perovskite light-emitting diodes.

Author

Sun, Wen Ting, He, Yanling, Ali, Muhammad Umair, Liu, Qiye, Mo, Hongbo, Wang, Sijia, Ng, Alan Man Ching, and Djurišić, Aleksandra B.

Abstract

We investigated the performance of sky-blue quasi-2D Dion–Jacobson perovskite light-emitting diodes as a function of perovskite composition and device architecture. Perovskite composition optimization is needed in order to optimize the film structure to achieve a compromise between efficient funneling and a consequent red shift of the emission, achieving emission in the blue spectral range. Composition optimization was achieved by adjusting the ratio of spacer cations methylenediammonium (MDA) and decanediammonium (DDA) and 3D perovskite CsPbBr3, to achieve films with optimal composition for sky-blue emission. In addition to the perovskite composition, the choice of the hole transport layer (HTL) had a significant effect on device efficiency. Significant enhancement in the efficiency from 1.8% (control device with a self-assembled monolayer HTL) to 4.1% (optimized HTL structure) is achieved by inserting diphenyl-4-triphenylsilylphenyl phosphine oxide (TSPO1) between the HTL layers and the perovskite. This results in an improved balance of electron and hole injection, as well as passivation of defects in the perovskite, which is responsible for the observed improvements in device performance. [ABSTRACT FROM AUTHOR]

Published
2023
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20. Outdoor stability testing of perovskite solar cells: Necessary step toward real-life applications.

Author

Ali, Muhammad Umair, Mo, Hongbo, Li, Yin, and Djurišić, Aleksandra B.

Subjects
SILICON solar cells, PEROVSKITE, ELECTRIC power system stability, MATERIALS testing, ENERGY storage
Abstract

Perovskite solar cells (PSCs) are among the most promising emerging photovoltaic technologies, due to their high efficiency, comparable to that of silicon solar cells. However, concerns about the stability of these devices remain, despite great progress achieved in recent years. To address these concerns, comprehensive investigations of their stability under realistic operating conditions are necessary. In this Perspective, we will discuss the outdoor testing of PSCs. We will first introduce degradation mechanisms relevant for intrinsic stability, as well as degradation mechanisms due to ambient exposure. Effective encapsulation of PSCs will then be discussed, followed by a summary of achieved progress and discussion of testing protocols and equipment to make outdoor testing more accessible. Finally, challenges and future outlook will be discussed. [ABSTRACT FROM AUTHOR]

Published
2023
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21. Metal oxide nanoparticles with low toxicity

Author

Ng, Alan Man Ching, Guo, Mu Yao, Leung, Yu Hang, Chan, Charis M.N., Wong, Stella W.Y., Yung, Mana M.N., Ma, Angel P.Y., Djurišić, Aleksandra B., Leung, Frederick C.C., Leung, Kenneth M.Y., Chan, Wai Kin, and Lee, Hung Kay

Published
2015
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36. Effects of ambient exposure on photoluminescence of Dion–Jacobson tin-based halide perovskites.

Author

Sun, Wen Ting, Xing, Zengshan, Sergeev, Aleksandr, He, Yanling, Ng, Alan Man Ching, Wong, Kam Sing, Molčanov, Lidija, Popović, Jasminka, and Djurišić, Aleksandra B.

Abstract

Tin-based halide perovskite materials are of interest for light-emitting applications due to their broad yellow emission, but they are known to exhibit inferior stability compared to lead-based perovskites due to the tendency of Sn2+ to be readily oxidized. Here, we investigated the ambient stability of a Dion–Jacobson tin bromide perovskite. We found that the optical properties of the samples were more significantly affected by moisture rather than the ratio of Sn2+/Sn4+. The exposure to humidity resulted in changes in the ratio of 2D HDASnBr4 and hydrated 1D HDA3SnBr8 phases (where HDA denotes hexane-1,6-diammonium), with an initial increase (up to ∼40 h) in luminescence attributed to the increasing fraction of the hydrated 1D phase which contributes to self-trapped exciton emission. With further exposure to humidity, the material starts to degrade resulting in reduced luminescence after ∼40 h. The use of additives for the suppression of oxidation of Sn2+, namely SnCl2 and tetraethyl orthosilicate (TEOS), results in prolonging the lifetime of the samples (>260 h for thin films with additives, compared to 180 h for thin films without additives). However, the persistence of luminescence with an increased time of ambient exposure in samples prepared with additives can be attributed to the changes in the evolution of phase compositions (ratios of 2D and hydrated 1D phases) over time rather than suppression of the oxidation of Sn2+. [ABSTRACT FROM AUTHOR]

Published
2023
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49. Improvement in the Performance of Inverted 3D/2D Perovskite Solar Cells by Ambient Exposure.

Author

Wang, Yantao, Lin, Jingyang, He, Yanling, Zhang, Yi, Liang, Qiong, Liu, Fangzhou, Zhou, Zhiwei, Chan, Christopher C. S., Li, Gang, Feng, Shien-Ping, Ng, Alan Man Ching, Wong, Kam Sing, Popović, Jasminka, and Djurišić, Aleksandra B.

Subjects
SOLAR cells, SPIN coating, PEROVSKITE, PASSIVATION, MOISTURE, ORGANIC coatings
Abstract

Perovskite solar cells (PSCs) are known to be sensitive to the exposure to ambient humidity, which typically results in the degradation and deterioration of performance, although positive effects of exposure to moisture have also been reported, due to recrystallization of the perovskite. Common approach to improve stability is to use 3D/2D perovskite active layer, where 2D capping layer is prepared by spin coating the bulky organic cation halide. Herein, it is shown that optimizing the exposure of the capping layer prepared by spin coating phenylethylammonium iodide (PEAI) to ambient atmosphere results in substantial improvement of the PSC performance. Furthermore, the initial effects of PEAI treatment are dependent on the NiOx/perovskite interface, but in all cases except at very high humidity (80–85% RH) optimized exposure to ambient results in improved performance. The variations in device performance with PEAI treatment and ambient exposure can be attributed to defect passivation and changes in the charge extraction due to energy‐level alignment at the interfaces. The best performing devices have passivation of NiOx/perovskite interface and PEAI treatment of top surface followed by exposure to ambient atmosphere at RH of 40–45%, which results in the power conversion efficiency increase from 20.3% to 22.4%. [ABSTRACT FROM AUTHOR]

Published
2022
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