Enhanced performance of tin-based perovskite solar cells induced by an ammonium hypophosphite additive

Cao, Jiangwei; Tai, Qidong; You, Peng; Tang, Gongguo; Wang, Tianyue; Wang, Naixiang; Yan, Feng

doi:10.1039/c9ta08679j

Cited by 119 publications

(108 citation statements)

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“…It can be found that the solar cells with WS 2 interlayer has a lower leakage current than that of the control one, indicating the decreased carrier generation rate and background carrier density in the device. Because the carrier generation rate in a solar cell is related to the trap density in the device, [ 40–42 ] this result indicates that the introduction of WS 2 can decrease the trap density in the devices.…”

Section: Resultsmentioning

confidence: 99%

Enhanced Performance of Planar Perovskite Solar Cells Induced by Van Der Waals Epitaxial Growth of Mixed Perovskite Films on WS₂ Flakes

Cao

Tang

You

et al. 2020

Adv Funct Materials

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Organic–inorganic metal halide perovskite solar cells (PSCs) have attracted much research interest owing to their high power conversion efficiency (PCE), solution processability, and the great potential for commercialization. However, the device performance is closely related to the quality of the perovskite film and the interface properties, which cannot be easily controlled by solution processes. Here, 2D WS2 flakes with defect‐free surfaces are introduced as a template for van der Waals epitaxial growth of mixed perovskite films by solution process for the first time. The mixed perovskite films demonstrate a preferable growth along (001) direction on WS2 surfaces. In addition, the WS2/perovskite heterojunction forms a cascade energy alignment for efficient charge extraction and reduced interfacial recombination. The inverted PSCs with WS2 interlayers show high PCEs up to 21.1%, which is among the highest efficiency of inverted planar PSCs. This work demonstrates that high‐mobility 2D materials can find important applications in PSCs as well as other perovskite‐based optoelectronic devices.

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Section: Resultsmentioning

confidence: 99%

Enhanced Performance of Planar Perovskite Solar Cells Induced by Van Der Waals Epitaxial Growth of Mixed Perovskite Films on WS₂ Flakes

Cao

Tang

You

et al. 2020

Adv Funct Materials

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“…The 2D/3D perovskite layer showed improved morphology and band-level alignment compared with 3D FASnI3 layer. As a result, the 2D/3D champion PSCs achieved a PCE of 7.86 % with a Jsc of 22.6 mA/cm 2 , a Voc of 0.54 V, and an FF of 64% [76]. Kayesh et al studied the effects of doping 5-ammonium valeric acid iodide (5-AVAI) in 3D FASnI3 film; they found 5-AVAI can passivate the grain boundaries, suppress the Sn 2+ oxidation, and enhance the charge carrier lifetime.…”

Section: D/3d Sn Perovskite Solar Cellsmentioning

confidence: 96%

“…Moreover, the devices exhibited good long-term stability both in pure N 2 and ambient atmospheres [74]. Today, high-performance Sn-based PSCs are mainly based on FASnI 3 as light absorber [75][76][77][78]. Table 2 shows some key photovoltaic parameters of FASnI 3 .…”

Section: Fasni3mentioning

confidence: 99%

The Low-Dimensional Three-Dimensional Tin Halide Perovskite: Film Characterization and Device Performance

Gai

Wang

et al. 2019

Energies

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Halide perovskite solar cells (PSCs) are considered as one of the most promising candidates for the next generation solar cells as their power conversion efficiency (PCE) has rapidly increased up to 25.2%. However, the most efficient halide perovskite materials all contain toxic lead. Replacing the lead cation with environmentally friendly tin (Sn) is proposed as an important alternative. Today, the inferior performance of Sn-based PSCs mainly due to two challenging issues, namely the facile oxidation of Sn2+ to Sn4+ and the low formation energies of Sn vacancies. Two-dimensional (2D) halide perovskite, in which the large sized organic cations confine the corner sharing BX6 octahedra, exhibits higher formation energy than that of three-dimensional (3D) structure halide perovskite. The approach of mixing a small amount of 2D into 3D Sn-based perovskites was demonstrated as an efficient method to produce high performance perovskite films. In this review, we first provide an overview of key points for making high performance PSCs. Then we give an introduction to the physical parameters of 3D ASnX3 (MA+, FA+, and Cs+) perovskite and a photovoltaic device based on them, followed by an overview of 2D/3D halide perovskites based on ASnX3 (MA+ and FA+) and their optoelectronic applications. The current challenges and a future outlook of Sn-based PSCs are discussed in the end. This review will give readers a better understanding of the 2D/3D Sn-based PSCs.

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“…The reducing process was proposed to be

{S n}^{4 +} + 3 H_{2} {P O}_{2}^{-} {\to S n}^{2 +} + 2 H {P O}_{3}^{2 -} + {P H}_{4}^{+}

, during which the oxidized Sn 4+ was converted back to Sn 2+ and led to reduced defects (Figure e). Moreover, AHP was found to be able to effectively suppress the phase separation of SnCl 2 and assist the growth of perovskite grain (Figure f) …”

Section: Reducing Agents For Performance Enhancementmentioning

confidence: 99%

Section: Reducing Agents For Performance Enhancementmentioning

confidence: 99%

Reducing Agents for Improving the Stability of Sn‐based Perovskite Solar Cells

Wang

Yan

2020

Chemistry An Asian Journal

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Organic-inorganic hybrid perovskite solar cells (PSCs) have aroused tremendous research interest for their high efficiency, low cost and solution processability. However, the involvement of toxic lead in state-of-art perovskites hinders their market prospects. As an alternative, Sn-based perovskites exhibit similar semiconductor characteristics and can potentially achieve comparable photovoltaic performance in comparison with their lead-based counterparts. The main challenge of developing Sn-based PCSs lies in the intrinsic poor stability of Sn 2 + , which could be oxidized and converted to Sn 4 + . Notably, introduction of SnX 2 (X = Cl, Br, I) additive becomes indispensable in the fabrication process, which highlights the importance of incorporating a reducing agent to improve the device stability. Additionally, efforts are made to utilize other reducing agents with different functions for the further enhancement of device performance. Currently, Sn-based PSCs could attain a record efficiency over 10% with great stability. In this review, we present the recent progress on reducing agents for improving the stability of Sn-based PSCs, and we hope to shed light on the challenges and opportunities of this research field. 2 3 4 5 6 7 8

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Enhanced performance of tin-based perovskite solar cells induced by an ammonium hypophosphite additive

Abstract: Bi-functional ammonium hypophosphite (AHP) is introduced to improve the performance and long term stability of FASnI3 solar cells.

Cited by 119 publications

References 50 publications

Enhanced Performance of Planar Perovskite Solar Cells Induced by Van Der Waals Epitaxial Growth of Mixed Perovskite Films on WS₂ Flakes

Enhanced Performance of Planar Perovskite Solar Cells Induced by Van Der Waals Epitaxial Growth of Mixed Perovskite Films on WS₂ Flakes

The Low-Dimensional Three-Dimensional Tin Halide Perovskite: Film Characterization and Device Performance

Reducing Agents for Improving the Stability of Sn‐based Perovskite Solar Cells

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Enhanced performance of tin-based perovskite solar cells induced by an ammonium hypophosphite additive

Abstract: Bi-functional ammonium hypophosphite (AHP) is introduced to improve the performance and long term stability of FASnI3 solar cells.

Cited by 119 publications

References 50 publications

Enhanced Performance of Planar Perovskite Solar Cells Induced by Van Der Waals Epitaxial Growth of Mixed Perovskite Films on WS2 Flakes

Enhanced Performance of Planar Perovskite Solar Cells Induced by Van Der Waals Epitaxial Growth of Mixed Perovskite Films on WS2 Flakes

The Low-Dimensional Three-Dimensional Tin Halide Perovskite: Film Characterization and Device Performance

Reducing Agents for Improving the Stability of Sn‐based Perovskite Solar Cells

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Product

Resources

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Enhanced Performance of Planar Perovskite Solar Cells Induced by Van Der Waals Epitaxial Growth of Mixed Perovskite Films on WS₂ Flakes

Enhanced Performance of Planar Perovskite Solar Cells Induced by Van Der Waals Epitaxial Growth of Mixed Perovskite Films on WS₂ Flakes