The effect of defects in tin-based perovskites and their photovoltaic devices

Cao, Huatang; Zhang, Z.; Zhang, M.; Gu, Anjie; Yu, Hongsong; Ban, Huaxia; Sun, Qiang; Shen, Yan; Zhang, X.-L.; Zhu, Jun; Wang, Minghao

doi:10.1016/j.mtphys.2021.100513

Cited by 24 publications

(30 citation statements)

References 149 publications

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“…Similarly, the calculated trap densities of the fabricated electron-only devices are 5.5 × 10 15 and 2.7 × 10 15 cm –3 for CB–PVK and CB+PC–PVK, respectively. Thus, the reduced defect density in CB+PC–PVK can suppress nonradiative recombination in the film, , which could be due to the formation of perovskite seeds for templated perovskite growth.…”

Section: Resultsmentioning

confidence: 99%

“…Similarly, the calculated trap densities of the fabricated electron-only devices are 5.5 × 10 15 and 2.7 × 10 15 cm −3 for CB−PVK and CB+PC−PVK, respectively. Thus, the reduced defect density in CB+PC−PVK can suppress nonradiative recombination in the film,39,40 which could be due to the formation of perovskite seeds for templated perovskite growth.Moreover, steady-state photoluminescence (PL) and timeresolved photoluminescence (TRPL) studies were conducted to investigate the charge-carrier dynamics of perovskite films treated with different antisolvents (Figure3g, h). Although steady-state PL, CB−PVK, and CB+PC−PVK exhibit the same emission at around 778 nm, the latter has a much higher PL intensity.…”

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confidence: 99%

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Additive Engineering in Antisolvent for Widening the Processing Window and Promoting Perovskite Seed Formation in Perovskite Solar Cells

Chen

Zhou

Jiang

et al. 2022

ACS Appl. Mater. Interfaces

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The chlorobenzene (CB) antisolvent is widely used to fabricate high-efficiency perovskite solar cells (PSCs). However, the narrow processing window and the strict volume ratio of a binary mixed solvent limit the fabrication of large-area and high-quality perovskite films. In this work, by systematic investigation of additives with the CB antisolvent, a universal guideline is achieved wherein a small amount of additive with a donor number between 9.0 and 27.0 kcal/mol can significantly widen the antisolvent treating time slot from 2 to 40 s while simultaneously enlarging the processor binary mixed solvent (dimethylformamide/dimethyl sulfoxide) from 7:3 to 0:10. Moreover, this process facilitates the formation of perovskite seeds as templates for perovskite crystal growth, effectively reducing the bulk defects in perovskite films. Finally, the obtained PSCs show remarkable power conversion efficiencies (PCEs) of 22.22 and 19.74% for rigid and flexible devices, respectively.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Additive Engineering in Antisolvent for Widening the Processing Window and Promoting Perovskite Seed Formation in Perovskite Solar Cells

Chen

Zhou

Jiang

et al. 2022

ACS Appl. Mater. Interfaces

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“…TTF−BTD derivative was synthesized by the method that mentioned above. [1,3]dithiole-2-thione (3 g, 14 mmol) and triethylamine (25 mL) in dichloromethane (300 mL). After addition, the reaction mixture was heated to reflux for 6 h. The solution was cooled and concentrated in a vacuum followed by trituration in water (100 mL) and the product was extracted with dichloromethane (300 mL).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…The combined organic phase was washed with water (200 mL), saturated NaHCO 3 (aq) (200 mL), 1 M Na 2 SO 3 (aq) (200 mL), and then dried with MgSO 4 . The solvent was evaporated under reduced pressure and the crude product was recrystallized from ethanol, then solubilized in chloroform (30 mL), and passed through a plug of silica gel to afford 4,8dibromo- [1,3] c][1,2,5]thiadiazole-6-thione (4 g, 10 mmol) in a triethyl phosphite (50 mL, freshly distilled) and the reaction mixture was stirred for 2 h at 100− 105 °C. After cooling to room temperature, the precipitate was collected, washed with methyl alcohol, and dried to give methyl 2-(4,8-dibromo- [1,3] 4).…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

“…Our growing energy dependence on fossil energy, along with increasing greenhouse gas emissions, has yielded efforts to promote economically viable and alternative resources of energy. , Hence, it becomes necessary to make a leap in innovative technologies, and reliance on fossil fuels should be restricted. The cyclic carbon-free energies are a great relief for the upcoming demands of energy .…”

Section: Introductionmentioning

confidence: 99%

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Tetrathiafulvalene–Benzothiadiazole: A Metal-Free Photocatalyst for Hydrogen Production

et al. 2022

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In this work, a series of hybrid tetrathiafulvalene−benzothiadiazole (TTF− BTD) are designed and applied as a metal-free photocatalyst for hydrogen production, particularly under visible light irradiation. Density functional theory calculations are used to shed light on the photophysical properties observed in the various TTF−BTD derivatives and investigated by the obtained data. Because band gap engineering has normally been used as an effective approach, we studied the effect of the various functional groups on the band gap to set a favorable band alignment with photocatalysts. An increase in highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels is observed in the order CH 3 < Br < CF 3 < COOMe < CN. The results discover that COOMe-TTF-CN-BTD can have a clear photocatalytic potential in the hydrogen production for specific applications. Our experimental and theoretical studies reveal that the CN-withdrawing group increases the reduction potential of the conduction band; meanwhile, COOMe decreases the reduction potential of the valance band. Moreover, we demonstrate that H 2 O reduction and oxidation reaction energies are both located inside the COOMe-TTF-CN-BTD band gap that enables an enhanced photocatalytic hydrogen evolution rate of 122 μmol h −1 g −1 under visible light. The efficiency of the COOMe-TTF-CN-BTD photocatalyst is also described in terms of medium pH and the nature of the sacrificial agent, where the maximum hydrogen production efficiency is observed at high pH. The findings point to a means of efficient production of hydrogen that can be directly achieved under visible light irradiation without any modifications.

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Bi‐Functional Phosphine Oxide Passivator for Efficient Near‐Infrared Sn‐Based Perovskite Light‐Emitting Diodes with Ultra‐Low Efficiency Roll‐Off

Meng,

Guan,

Weng

et al. 2023

Adv Funct Materials

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Recently, lead‐free Sn‐based perovskite light‐emitting diodes (PeLEDs) have attracted wide attention due to their near‐infrared emission and environmental friendliness. However, desired Sn2+ is easily oxidized to Sn4+ in the crystallization process, resulting in defects and intrinsically p‐doped properties in the perovskite films. The uncontrollable oxidation affects the charge injection balance and radiative recombination, leading to poor device performance. Herein, a bi‐functional conductive molecular, 2,7‐bis(diphenylphosphoryl)‐9,9′‐spirobifluorene (SPPO13) with two P═O functional groups, is used to interact with perovskite to passivate defects and suppress the oxidation of Sn2+. Moreover, the SPPO13 modification layer inserted between the perovskite emitter and the electron transport layer can regulate the carrier injection and transport, thus promoting the charge balance. As a result, the high‐performance near‐infrared CsSnI3 PeLEDs with a record external quantum efficiency (EQE) of 6.60% and ultra‐low efficiency roll‐off are achieved. The work provides a novel approach to regulate defect passivation and charge transport for efficient Sn‐based PeLEDs.

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The effect of defects in tin-based perovskites and their photovoltaic devices

Cited by 24 publications

References 149 publications

Additive Engineering in Antisolvent for Widening the Processing Window and Promoting Perovskite Seed Formation in Perovskite Solar Cells

Additive Engineering in Antisolvent for Widening the Processing Window and Promoting Perovskite Seed Formation in Perovskite Solar Cells

Tetrathiafulvalene–Benzothiadiazole: A Metal-Free Photocatalyst for Hydrogen Production

Bi‐Functional Phosphine Oxide Passivator for Efficient Near‐Infrared Sn‐Based Perovskite Light‐Emitting Diodes with Ultra‐Low Efficiency Roll‐Off

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