Reductive 2D Capping Layers through Dopamine Salt Incorporation for Pb–Sn Mixed Perovskite Solar Cells

Meng, Rui; Li, Can; Shi, Jishan; Wan, Zhi; Li, Zhihao; Zhi, Chongyang; Zhang, Yicong; Li, Zhen

doi:10.1021/acsenergylett.3c02039

Cited by 9 publications

(3 citation statements)

References 51 publications

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“…The PCE of the resultant cells was improved along with device resistance to air: Unencapsulated mixed Sn−Pb PSCs maintained their full performance after 150 h at 85 °C in air. There are also several different molecules that have the ability to reduce the amount of Sn(IV) or suppress its formation, such as hydrazinium (HA + ), dopamine cation (DAH + ), and borohydride-based materials, , or maltol, a metal-chelating compound, which was used to produce perovskite films with carrier lifetimes of over 7 μs, which were later implemented to fabricate devices with PCEs over 21% (Figure a-ii) …”

Section: Interface Engineering For Solar Cellsmentioning

confidence: 99%

“…Thanks to the reduced energy barrier at the top interface, the carrier transfer and the performance of the cells fabricated with the 2L capped film were substantially improved compared with the 1L case. Other 2D phases composed with new spacers have also been investigated as capping layers for the 3D bulk perovskites, such as N -(3-aminopropyl)-2-pyrrolidinone and 4-hydroxyphenethylammonium, and the DJ types, p -phenyl dimethylammonium, 3-(aminomethyl)piperidinium, 3,4-dihydroxyphenethylammonium, and 1,4-butanediammonium diiodide (Figure b-ii) …”

Section: Interface Engineering For Solar Cellsmentioning

confidence: 99%

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Narrow Bandgap Metal Halide Perovskites for All-Perovskite Tandem Photovoltaics

Hu,

Thiesbrummel,

Pascual

et al. 2024

Chem. Rev.

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All-perovskite tandem solar cells are attracting considerable interest in photovoltaics research, owing to their potential to surpass the theoretical efficiency limit of single-junction cells, in a cost-effective sustainable manner. Thanks to the bandgap-bowing effect, mixed tin−lead (Sn−Pb) perovskites possess a close to ideal narrow bandgap for constructing tandem cells, matched with wide-bandgap neat lead-based counterparts. The performance of all-perovskite tandems, however, has yet to reach its efficiency potential. One of the main obstacles that need to be overcome is theoftentimeslow quality of the mixed Sn−Pb perovskite films, largely caused by the facile oxidation of Sn(II) to Sn(IV), as well as the difficult-to-control film crystallization dynamics. Additional detrimental imperfections are introduced in the perovskite thin film, particularly at its vulnerable surfaces, including the top and bottom interfaces as well as the grain boundaries. Due to these issues, the resultant device performance is distinctly far lower than their theoretically achievable maximum efficiency. Robust modifications and improvements to the surfaces of mixed Sn−Pb perovskite films are therefore critical for the advancement of the field. This Review describes the origins of imperfections in thin films and covers efforts made so far toward reaching a better understanding of mixed Sn−Pb perovskites, in particular with respect to surface modifications that improved the efficiency and stability of the narrow bandgap solar cells. In addition, we also outline the important issues of integrating the narrow bandgap subcells for achieving reliable and efficient all-perovskite double-and multi-junction tandems. Future work should focus on the characterization and visualization of the specific surface defects, as well as tracking their evolution under different external stimuli, guiding in turn the processing for efficient and stable single-junction and tandem solar cell devices.

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Section: Interface Engineering For Solar Cellsmentioning

confidence: 99%

Section: Interface Engineering For Solar Cellsmentioning

confidence: 99%

Narrow Bandgap Metal Halide Perovskites for All-Perovskite Tandem Photovoltaics

Hu,

Thiesbrummel,

Pascual

et al. 2024

Chem. Rev.

View full text Add to dashboard Cite

show abstract

“…Examples of such reducing agents include dopamine cation (DAH + ), caffeic acid (CA), hydrazine sulfate (HS), and others. The addition of these reducing agents to the perovskite precursor solution serves as a strategic approach to mitigate the oxidation of Sn II and thereby enhance the overall stability of the perovskite film [ 12 , 13 , 14 ]. One effective method for enhancing film stability involves the incorporation of Lewis base additives, which form strong coordination bonds with Sn II atoms, thereby suppressing their oxidation.…”

Section: Introductionmentioning

confidence: 99%

Polymer Lewis Base for Improving the Charge Transfer in Tin–Lead Mixed Perovskite Solar Cells

Xing,

Deng,

Wang

et al. 2024

Nanomaterials

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The poor film stability of Sn-Pb mixed perovskite film and the mismatched interface energy levels pose significant challenges in enhancing the efficiency of tin–lead (Sn-Pb) mixed perovskite solar cells. In this study, polyvinylpyrrolidone (PVP) is introduced into the PVK perovskite precursor solution, effectively enhancing the overall stability of the film. This improvement is achieved through the formation of robust coordination bonds between the carbonyl (C=O) in the pyrrole ring and the undercoordinated SnII and PbII, thereby facilitating the passivation of defects. Furthermore, the introduction of PVP inhibits the oxidation of tin (Sn), thereby enhancing the n-type characteristics of the perovskite film. This adjustment in the energy level of the PVK perovskite film proves instrumental in reducing interface energy loss, subsequently improving interface charge transfer and mitigating device recombination. Consequently, perovskite solar cells incorporating PVP achieve an outstanding champion power conversion efficiency (PCE) of 21.31%.

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Synergistic Treatments of Bulk and Surface in Tin‐Lead Mixed Perovskite for Efficient All‐Perovskite Tandem Solar Cells

Xie,

Jin,

Cao

et al. 2024

Adv Funct Materials

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Narrow‐bandgap (NBG) perovskites have attracted significant attention for their promising potential as light‐absorbing materials in tandem solar cells. However, tin‐lead mixed perovskites face a major limitation of the facile oxidation of Sn2⁺, leading to Sn vacancies in the perovskite films. In this study, sodium triacetoxyborohydride (STAB) is introduced as an antioxidant, while potassium (5‐bromo‐2‐fluoropyridin‐3‐yl)trifluoroborate (PBFT) is employed as a surface modifier for mixed tin‐lead perovskites. This combined approach not only suppresses Sn2⁺ oxidation but also promotes the formation of high‐quality perovskite films. Furthermore, the induced energy band bending at the perovskite/C60 interface substantially enhances charge transfer. Consequently, the optimized device achieves a power conversion efficiency (PCE) of 23.41% with excellent illumination stability. When paired with a wide‐bandgap (WBG) semi‐transparent perovskite solar cell (PSC), the resulting four‐terminal (4‐T) all‐perovskite tandem solar cell attains a remarkable efficiency of 27.37%.

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Reductive 2D Capping Layers through Dopamine Salt Incorporation for Pb–Sn Mixed Perovskite Solar Cells

Cited by 9 publications

References 51 publications

Narrow Bandgap Metal Halide Perovskites for All-Perovskite Tandem Photovoltaics

Narrow Bandgap Metal Halide Perovskites for All-Perovskite Tandem Photovoltaics

Polymer Lewis Base for Improving the Charge Transfer in Tin–Lead Mixed Perovskite Solar Cells

Synergistic Treatments of Bulk and Surface in Tin‐Lead Mixed Perovskite for Efficient All‐Perovskite Tandem Solar Cells

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