Illumination Durability and High-Efficiency Sn-Based Perovskite Solar Cell under Coordinated Control of Phenylhydrazine and Halogen Ions

Wang, Chengbo; Zhang, Yuting; Gu, Feidan; Zhao, Zeang; Li, Haisheng; Jiang, Hong; Bian, Zuqiang; Liu, Zhiwei

doi:10.1016/j.matt.2020.11.012

Cited by 182 publications

(150 citation statements)

References 44 publications

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“…Hence, during crystallization, it is expelled from the perovskite lattices and accumulates at the film's grain boundaries and surface, contributing to the filling of the pinholes and grain boundaries. [12,18] The multiple bonds between BAAc and SnI 2 effectively slow down the crystal growth rate of perovskite films. The hydrogen bonds (NH…I) formed between the ammonium group in BA + and Iin [SnX 6 ] 4− framework may inhibit the migration of Iions to the surface of the film and the oxidation process of Iions to I 2 or I 3 -, which would reduce iodide defects and further suppress the degradation of the perovskite film to a certain extent.…”

Section: Resultsmentioning

confidence: 99%

Ionic Liquid Stabilizing High‐Efficiency Tin Halide Perovskite Solar Cells

et al. 2021

Advanced Energy Materials

152

149

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Tin halide perovskites attract incremental attention to deliver lead‐free perovskite solar cells. Nevertheless, disordered crystal growth and low defect formation energy, related to Sn(II) oxidation to Sn(IV), limit the efficiency and stability of solar cells. Engineering the processing from perovskite precursor solution preparation to film crystallization is crucial to tackle these issues and enable the full photovoltaic potential of tin halide perovskites. Herein, the ionic liquid n‐butylammonium acetate (BAAc) is used to tune the tin coordination with specific O…Sn chelating bonds and NH…X hydrogen bonds. The coordination between BAAc and tin enables modulation of the crystallization of the perovskite in a thin film. The resulting BAAc‐containing perovskite films are more compact and have a preferential crystal orientation. Moreover, a lower amount of Sn(IV) and related chemical defects are found for the BAAc‐containing perovskites. Tin halide perovskite solar cells processed with BAAc show a power conversion efficiency of over 10%. This value is retained after storing the devices for over 1000 h in nitrogen. This work paves the way toward a more controlled tin‐based perovskite crystallization for stable and efficient lead‐free perovskite photovoltaics.

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Section: Resultsmentioning

confidence: 99%

Ionic Liquid Stabilizing High‐Efficiency Tin Halide Perovskite Solar Cells

et al. 2021

Advanced Energy Materials

152

149

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“…Our literature survey discussed above indicates that charge-carrier lifetimes rarely exceed a few nanoseconds, and perhaps unsurprisingly, best single-cell PCEs have so far been much lower than those for lead-only counterparts, with recently reported values reaching slightly above 13%. 83 , 122 While such PCEs are far below the theoretically attainable single-junction limit, 10 , 11 it is worth acknowledging that better-performing lead-free contenders have yet to emerge from the plethora of metal halide semiconductors explored to date. 13 Attaining long-term, sustainable control over tin vacancy formation in lead-free tin iodide perovskites, and its detrimental effects on bandgaps, charge-carrier lifetimes, and mobilities, is therefore perhaps the most challenging goal of all.…”

Section: Summary and Future Directionsmentioning

confidence: 99%

Optoelectronic Properties of Tin–Lead Halide Perovskites

2021

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Mixed tin–lead halide perovskites have recently emerged as highly promising materials for efficient single- and multi-junction photovoltaic devices. This Focus Review discusses the optoelectronic properties that underpin this performance, clearly differentiating between intrinsic and defect-mediated mechanisms. We show that from a fundamental perspective, increasing tin fraction may cause increases in attainable charge-carrier mobilities, decreases in exciton binding energies, and potentially a slowing of charge-carrier cooling, all beneficial for photovoltaic applications. We discuss the mechanisms leading to significant bandgap bowing along the tin–lead series, which enables attractive near-infrared bandgaps at intermediate tin content. However, tin-rich stoichiometries still suffer from tin oxidation and vacancy formation which often obscures the fundamentally achievable performance, causing high background hole densities, accelerating charge-carrier recombination, lowering charge-carrier mobilities, and blue-shifting absorption onsets through the Burstein–Moss effect. We evaluate impacts on photovoltaic device performance, and conclude with an outlook on remaining challenges and promising future directions in this area.

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“…Suppressing these oxidation processes is therefore the key to realizing high device performance. Several means have been reported to reduce the Sn(IV) content in tin-containing perovskite films, including reducing agents, such as hypophosphorous acid 15 , hydrazine vapor 16 , Sn powders 17 and nanoparticles 18 , and phenylhydrazine hydrochloride 19 , as well as antioxidants, including hydroquinone sulfonic acid 20 , gallic acid 21 , and ascorbic acid 22 .…”

Section: Introductionmentioning

confidence: 99%

Optimized Carrier Extraction at Interfaces for 23.6% Efficient Tin–Lead Perovskite Solar Cells

Otsuka

Murdey

et al. 2021

Preprint

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Carrier extraction is a key issue which limits the efficiency of perovskite solar cells. In this work, carrier extraction is improved by modifying the perovskite layers with a combination of ethylenediammonium diiodide post-treatment and glycine hydrochloride additive. Ethylenediammonium dications primarily affect the top surface of the perovskite films, while glycinium cations preferentially accumulate at the bottom region. The top and bottom interface modifications improve the crystallinity of the perovskite films and lower the density of electrical traps via surface passivation effects, resulting in long charge carrier lifetimes. The orientated aggregation of the ethylenediammonium and glycinium cations at the charge collection interfaces result in the formation of surface dipoles, which facilitate charge extraction. The performance of the treated solar cell devices also increases. The fill factor rose to 0.82, and the power conversion efficiency reaches 23.6% (23.1% certified). The open circuit voltage reaches 0.91 V, just 0.06 V below the Shockley–Queisser limit. The unencapsulated devices also show improved stability under AM 1.5G, retaining over 80% of the initial efficiency after 200 h continuous operation in inert atmosphere. Our strategy is also successfully applied to centimeter-scale devices, with efficiencies up to 21.0%.

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Illumination Durability and High-Efficiency Sn-Based Perovskite Solar Cell under Coordinated Control of Phenylhydrazine and Halogen Ions

Cited by 182 publications

References 44 publications

Ionic Liquid Stabilizing High‐Efficiency Tin Halide Perovskite Solar Cells

Ionic Liquid Stabilizing High‐Efficiency Tin Halide Perovskite Solar Cells

Optoelectronic Properties of Tin–Lead Halide Perovskites

Optimized Carrier Extraction at Interfaces for 23.6% Efficient Tin–Lead Perovskite Solar Cells

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