Towards low-temperature processing of efficient γ-CsPbI<sub>3</sub> perovskite solar cells

Zhang, Zongbao; Ji, Ran; Hofstetter, Yvonne J.; Deconinck, Marielle; Brunner, Julius; Li, Yanxiu; An, Qingzhi; Vaynzof, Yana

doi:10.1039/d3ta03249c

Cited by 4 publications

(4 citation statements)

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“…Recently, benefiting from the merits of high hole selectivity, efficient hole transfer, and low interface trap density, the carbazole core-based phosphonic acid self-assembled monolayers (SAMs) have been proven to be a promising HTL and enabled significant performance enhancements in both single-junction and perovskite-based tandem solar cells. − With covalent binding to the substrate surface, these SAMs are relatively tolerant against perovskite processing and could potentially offer a nanoscale conformal coverage on textured surfaces. Moreover, SAMs not only regulate energy levels and surface wettability but also passivate interfacial trap states and provide low transport losses. − Nevertheless, it is found that the related application of SAMs in inverted inorganic PSCs is still extremely limited compared with those in organic–inorganic hybrid perovskite systems, , where the recorded PCE has exceeded 25% . Thus, this spurred us to expand the application of SAMs to inorganic PSCs and explore whether SAMs can also promote the performance of inverted CsPbI 3 PSCs.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, SAMs not only regulate energy levels and surface wettability but also passivate interfacial trap states and provide low transport losses. 32−35 Nevertheless, it is found that the related application of SAMs in inverted inorganic PSCs is still extremely limited compared with those in organic− inorganic hybrid perovskite systems, 36,37 where the recorded PCE has exceeded 25%. 38 Thus, this spurred us to expand the application of SAMs to inorganic PSCs and explore whether SAMs can also promote the performance of inverted CsPbI 3 PSCs.…”

Section: ■ Introductionmentioning

confidence: 99%

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Versatile Self-Assembled Monolayer Enables High-Performance Inverted CsPbI₃ Perovskite Solar Cells

Wang,

Liu,

Liu

et al. 2024

ACS Appl. Nano Mater.

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Self-assembled monolayers (SAMs) have been widely employed as hole transport layers (HTLs) to construct efficient and stable organic−inorganic hybrid perovskite solar cells (PSCs). However, the related application of SAMs in inverted inorganic PSCs is still extremely limited. Herein, [2-(9H-carbazol-9-yl) ethyl] phosphonic acid (2PACz) is successfully developed as a nanoscale HTL to fabricate high-performance inorganic CsPbI 3 PSCs. Compared with the conventional poly triphenyl-amine (PTAA), 2PACz SAM can tightly anchor on the fluorine-doped tin oxide (FTO) surface via chemical coordination, rendering a more favorable interface contact and matched energy level alignment with the perovskite. Besides, the perovskite film quality and interfacial charge extraction are greatly ameliorated, leading to suppressed charge recombination and voltage loss. As a result, the inverted CsPbI 3 PSC with 2PACz HTL exhibits a champion power conversion efficiency (PCE) of 18.89% in contrast to the PTAA device with a lower PCE of 17.07%. Moreover, both the unencapsulated 2PACz-based perovskite film and device stability present significant improvement. This study provides insights into the underexplored application of SAMs in inorganic PSCs, which will accelerate the advancement of perovskite photovoltaics.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Versatile Self-Assembled Monolayer Enables High-Performance Inverted CsPbI₃ Perovskite Solar Cells

Wang,

Liu,

Liu

et al. 2024

ACS Appl. Nano Mater.

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Section: Introductionmentioning

confidence: 99%

“…[17] Therefore, the possibility to reduce the annealing temperature of CsPbI 3 and the implementation of such HTLs could be an alternative strategy to further improve the performance of all-inorganic PSCs. [18] In this direction, many efforts have been made to reduce the annealing temperature of CsPbI 3 , such as the use of molten salts as perovskite solvents, [19,20] the application of vacuum treatment to the as-deposited perovskite layer, [21,22] increasing the annealing time, [23,24] adding sequential annealing steps at increasing temperatures, [25,26] or performing a preannealing step in nitrogen atmosphere followed by second annealing in humid air. [27] Despite the remarkable results achieved with these strategies, the additional levels of complexity induced in device processing partially drawback the potential of these approaches.…”

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confidence: 99%

The Stabilization of CsPbI_3−xBr_x Phase by Lowering Annealing Temperature for Efficient All‐Inorganic Perovskite Solar Cells

et al. 2023

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All‐inorganic perovskites are a promising solution for the fabrication of thermally stable perovskite solar cells (PSCs) with remarkable performances. However, a high annealing temperature is required for the stabilization of the photoactive phase of CsPbI3, which represents a limiting factor for their potential scaling‐up and manufacturing at industrial scale. This work demonstrates a new process for the stabilization of CsPbI3‐xBrx perovskite at lower annealing temperature of 180°, based on a rational halogen substitution enabled by the introduction of dimethylammonium (DMA) additives. Bromide inclusion favors indeed the conversion from the intermediate phases to CsPbI3‐xBrx. Standard mesoscopic solar cells prepared with this approach achieve a power conversion efficiency (PCE) of 14.86%, with reduced voltage losses and increased fill factor (FF) compared to the reference device. Moreover, this work proves that a rational substitution of the halide in the DMA salt is also beneficial for the devices annealed at higher temperature, achieving an encouraging PCE of 16.23%. By reducing the processing temperature, this new method widens the range of applications of all‐inorganic PSCs toward temperature‐sensitive materials and industrial applications.This article is protected by copyright. All rights reserved.

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Semitransparent Perovskite Solar Cells with an Evaporated Ultra‐Thin Perovskite Absorber

Zhang,

Ji,

Jia

et al. 2023

Adv Funct Materials

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Metal halide perovskites are of great interest for application in semitransparent solar cells due to their tunable bandgap and high performance. However, fabricating high‐efficiency perovskite semitransparent devices with high average visible transmittance (AVT) is challenging because of their high absorption coefficient. Here, a co‐evaporation process is adopted to fabricate ultra‐thin CsPbI3 perovskite films. The smooth surface and orientated crystal growth of the evaporated perovskite films make it possible to achieve 10 nm thin films with compact and continuous morphology without pinholes. When integrated into a p‐i‐n device structure of glass/ITO/PTAA/perovskite/PCBM/BCP/Al/Ag with an optimized transparent electrode, these ultra‐thin layers result in an impressive open‐circuit voltage (VOC) of 1.08 V and a fill factor (FF) of 80%. Consequently, a power conversion efficiency (PCE) of 3.6% with an AVT above 50% is demonstrated, which is the first report for a perovskite device of a 10 nm active layer thickness with high VOC, FF and AVT. These findings demonstrate that deposition by thermal evaporation makes it possible to form compact ultra‐thin perovskite films, which are of great interest for future smart windows, light‐emitting diodes, and tandem device applications.

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Towards low-temperature processing of efficient γ-CsPbI₃ perovskite solar cells

Abstract: Inorganic cesium lead iodide (CsPbI3) perovskite solar cells (PSCs) have attracted enormous attention due to their excellent thermal stability and optical bandgap (~1.73 eV), well-suited for tandem device applications. However,...

Cited by 4 publications

References 86 publications

Versatile Self-Assembled Monolayer Enables High-Performance Inverted CsPbI₃ Perovskite Solar Cells

Versatile Self-Assembled Monolayer Enables High-Performance Inverted CsPbI₃ Perovskite Solar Cells

The Stabilization of CsPbI_3−xBr_x Phase by Lowering Annealing Temperature for Efficient All‐Inorganic Perovskite Solar Cells

Semitransparent Perovskite Solar Cells with an Evaporated Ultra‐Thin Perovskite Absorber

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Towards low-temperature processing of efficient γ-CsPbI3 perovskite solar cells

Abstract: Inorganic cesium lead iodide (CsPbI3) perovskite solar cells (PSCs) have attracted enormous attention due to their excellent thermal stability and optical bandgap (~1.73 eV), well-suited for tandem device applications. However,...

Cited by 4 publications

References 86 publications

Versatile Self-Assembled Monolayer Enables High-Performance Inverted CsPbI3 Perovskite Solar Cells

Versatile Self-Assembled Monolayer Enables High-Performance Inverted CsPbI3 Perovskite Solar Cells

The Stabilization of CsPbI3−xBrx Phase by Lowering Annealing Temperature for Efficient All‐Inorganic Perovskite Solar Cells

Semitransparent Perovskite Solar Cells with an Evaporated Ultra‐Thin Perovskite Absorber

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Towards low-temperature processing of efficient γ-CsPbI₃ perovskite solar cells

Versatile Self-Assembled Monolayer Enables High-Performance Inverted CsPbI₃ Perovskite Solar Cells

Versatile Self-Assembled Monolayer Enables High-Performance Inverted CsPbI₃ Perovskite Solar Cells

The Stabilization of CsPbI_3−xBr_x Phase by Lowering Annealing Temperature for Efficient All‐Inorganic Perovskite Solar Cells