Slow Passivation and Inverted Hysteresis for Hybrid Tin Perovskite Solar Cells Attaining 13.5% via Sequential Deposition

Jokar, Efat; Chuang, He Shiang; Kuan, Chun Hsiao; Wu, Hui; Hou, Cheng‐Hung; Shyue, Jing Jong; Diau, Eric Wei‐Guang

doi:10.1021/acs.jpclett.1c03107

Cited by 70 publications

(59 citation statements)

References 30 publications

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“…TEASCN is synthesized by a reaction between basic 2‐thiopheneethylamine and acidic NH 4 SCN (Figure 1a, see Supporting Information for details) [15] . To verify the structure of the molecule, we characterized the product by 1 H NMR in DMSO‐ d 6 .…”

Section: Figurementioning

confidence: 99%

Quasi‐2D Bilayer Surface Passivation for High Efficiency Narrow Bandgap Perovskite Solar Cells

Wei

et al. 2022

Angew Chem Int Ed

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The combination of comprehensive surface passivation and effective interface carriers transfer plays a critical role in high-performance perovskite solar cells. A 2D structure is an important approach for surface passivation of perovskite film, however, its large band gap could compromise carrier transfer. Herein, we synthesize a new molecule 2-thiopheneethylamine thiocyanate (TEASCN) for the construction of bilayer quasi-2D structure precisely on a tin-lead mixed perovskite surface. This bilayer structure can passivate the perovskite surface and ensure effective carriers transfer simultaneously. As a result, the open-circuit voltage (V oc ) of the device is increased without sacrificing shortcircuit current density (J sc ), giving rise to a high certified efficiency from a credible third-party certification of narrow band gap perovskite solar cells. Furthermore, theoretical simulation indicates that the inclusion of TEASCN makes the bilayer structure thermodynamically more stable, which provides a strategy to tailor the number of layers of quasi-2D perovskite structures.Perovskite solar cells are generally regarded as the most promising next-generation thin film solar cells due to their excellent performance and low cost. Driven by composition engineering, [1] crystal growth manipulation, [2] defect passivation, [3] and band alignment, [4] the efficiency of perovskite solar cells has grown rapidly over the past few years. Recently, many reports indicate that interface defects are a critical factor influencing device performance, and tremendous efforts were made to remove surface defects. [3a, 5] The construction of a quasi-2D passivation layer on the surface of the perovskite film is regarded as one of the most promising strategies to remove defects due to its perfectly matched lattice and ease of fabrication. [6]

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Section: Figurementioning

confidence: 99%

Quasi‐2D Bilayer Surface Passivation for High Efficiency Narrow Bandgap Perovskite Solar Cells

Wei

et al. 2022

Angew Chem Int Ed

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“…Time-dependent density functional theory calculations indicate that LUMO levels of the A-site cation lie above the conduction band minima acting as carrier traps for perovskite materials. 50 A-Site cation blending with additives such as EDAI 2 25 and co-cations such as guanidinium, 30 azetidinium, 29 and phenylhydrazinium thiocyanate 51 show passivation effects with enhanced carrier lifetimes. The effect of surface passivation might induce shifting of LUMO levels of hybridized organic cations, which can scavenge surface charge carriers.…”

mentioning

confidence: 99%

Femtosecond Exciton and Carrier Relaxation Dynamics of Two-Dimensional (2D) and Quasi-2D Tin Perovskites

Narra

Lin

Seetharaman

et al. 2021

J. Phys. Chem. Lett.

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The dynamics of exciton and free-carrier relaxation of low-dimensional tin iodide perovskites, BA2FA n–1Sn n I3n+1, where n = 1 (N1), 2 (N2), 5 (N5), and 10 (N10), were investigated with femtosecond transient absorption spectra (TAS). The absorption and photoluminescence spectra of N1 and N2 show exciton characteristics due to quantum confinement, whereas N5 and N10 display a free-carrier nature, the same as for bulk three-dimensional (3D) films. The TAS profiles were fitted according to a global kinetic model with three time coefficients representing the interactions of biexcitons, trions, and excitons for N1 and N2 and hot carriers, cold carriers, and shallow trap carriers for N5 and N10. The carrier relaxation dynamics of N5 and N10 were similar to those of 3D FASnI3 except for the absence of surface recombination in the deep-trap states due to passivation of the grain surfaces by the long alkyl chain for these quasi-2D samples (N5/N10 vs 3D).

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“…Our results are also supported by other reports using an additive compound comprising SCN − . 16,21,53 These results suggest that the pseudohalide component (SCN − ) in PEASCN has a significant role in improving the quality of the FASnI 3 film.…”

Section: Resultsmentioning

confidence: 85%

Pseudohalide Functional Additives in Tin Halide Perovskite for Efficient and Stable Pb-Free Perovskite Solar Cells

Khadka

Shirai

Yanagida

et al. 2021

ACS Appl. Energy Mater.

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The progress of tin-based halide perovskite solar cells (Sn-HaPSCs) is obstructed by their poor stability arising from tin oxidation. Herein, we introduced phenethylammonium thiocyanate (PEASCN) as a pseudohalide functional additive into an FASnI3 perovskite film to improve the optoelectronic properties. This approach is found to be effective for the suppression of Sn oxidation and formation of a compact and larger grain film with a higher degree of crystallinity. The device with the PEASCN additive improved the device efficiency from 4.52% (for pristine Sn-HaP) to 9.65% with a significant increase of VOC from ∼0.411 to 0.667 V and superior device stability. The device analysis revealed that the PEASCN additive has improved the optoelectronic properties coupled with a higher diffusion potential and suppression of bulk and interface defects in the Sn-HaPSC. This work corroborates that the incorporation of a pseudohalide-based functional additive in FASnI3 is propitious for better film formation, passivation of detrimental surface chemistry, and defects at the interface and in the bulk.

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Slow Passivation and Inverted Hysteresis for Hybrid Tin Perovskite Solar Cells Attaining 13.5% via Sequential Deposition

Cited by 70 publications

References 30 publications

Quasi‐2D Bilayer Surface Passivation for High Efficiency Narrow Bandgap Perovskite Solar Cells

Quasi‐2D Bilayer Surface Passivation for High Efficiency Narrow Bandgap Perovskite Solar Cells

Femtosecond Exciton and Carrier Relaxation Dynamics of Two-Dimensional (2D) and Quasi-2D Tin Perovskites

Pseudohalide Functional Additives in Tin Halide Perovskite for Efficient and Stable Pb-Free Perovskite Solar Cells

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