Suppression of atomic vacancies via incorporation of isovalent small ions to increase the stability of halide perovskite solar cells in ambient air

Saidaminov, Makhsud I.; Kim, Junghwan; Jain, Ankit; Quintero-Bermúdez, Rafael; Tan, Hairen; Long, Guankui; Tan, Furui; Johnston, Andrew; Zhao, Yicheng; Voznyy, Oleksandr; Sargent, Edward H.

doi:10.1038/s41560-018-0192-2

Cited by 631 publications

(670 citation statements)

References 66 publications

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“…[1] Compared with BS-5, the photocurrent of BS-3 is significantly increased, whereas that of BS-1 is dramatically decreased, even thoughB S-1 has higher light absorption ability than BS-5. [10,[24][25][26] The enhanced separation efficiency of BS-3 is further confirmed by its steady-state PL spectrum, in which the intensity is much weaker than in those for BS-1 andB S-5 (Figure 5c), verifying the better performance of bismuth-deficient BS-3 in separating the photogenerated charges. As photogenerated electrons can recombine with holes, their involvement in the photocatalytic reaction could be hindered.…”

Section: Resultsmentioning

confidence: 61%

Defect‐Type‐Dependent Near‐Infrared‐Driven Photocatalytic Bacterial Inactivation by Defective Bi₂S₃ nanorods

Sun

Jiang

et al. 2019

ChemSusChem

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Defect engineering is crucial in tailoring photocatalytic efficiency, but it suffers from uncertainty in determining the vacancy type and in which type of the vacancy can better promote the photocatalytic efficiency. In this study, Bi2S3 nanorods with bismuth or sulfur vacancies were synthesized to investigate their distinct effects on the electronic structure, electron–hole separation characteristics, and near‐infrared (NIR)‐driven photocatalytic bacterial inactivation activity. Both bismuth and sulfur vacancies can enhance the light absorption ability of Bi2S3. However, the lifetime of photoinduced electrons is extended by bismuth vacancies but shortened by sulfur vacancies. Owing to these tendencies, Bi2S3 with Bi vacancies fully inactivated 7 log E. coli cells within 40 min of NIR irradiation, displaying better NIR‐driven photocatalytic bacterial inactivation efficiency than Bi2S3 with S vacancies. This study discloses the defect‐type‐dependent photocatalytic behaviors, providing new insights into designing highly efficient photocatalysts.

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Section: Resultsmentioning

confidence: 61%

Defect‐Type‐Dependent Near‐Infrared‐Driven Photocatalytic Bacterial Inactivation by Defective Bi₂S₃ nanorods

Sun

Jiang

et al. 2019

ChemSusChem

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“…When storing the devices in an ambient atmosphere with an RH of 65%, the unencapsulated MA1 devices retained only 20% of their original PCE following 3 days ( Figure S22a, Supporting Information); whereas DMA0.11 retained over 60% of its original PCE after a period of 12 days. [15] The improved long-term stability for the DMA0.11-based devices can be ascribed to its higher water adsorption energy, as well as lower defect densities. This rate of degradation is slower than the best value (−0.1% min −1 ) reported across PSCs.…”

Section: Wwwadvmatde Wwwadvancedsciencenewscommentioning

confidence: 99%

Efficient and Stable Inverted Perovskite Solar Cells Incorporating Secondary Amines

et al. 2019

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Low-cost and high-efficiency solar cells are attractive candidates to meet the growing demand for renewable energy. Silicon solar cells have reached a power conversion efficiency (PCE) of 26.6%, [1] approaching their theoretical limit; tandem solar cells offer a means to improve further the efficiency of solar cells.Large-bandgap perovskites offer a route to improve the efficiency of energy capture in photovoltaics when employed in the front cell of perovskite-silicon tandems. Implementing perovskites as the front cell requires an inverted (p-i-n) architecture; this architecture is particularly effective at harnessing highenergy photons and is compatible with ionic-dopant-free transport layers. Here, a power conversion efficiency of 21.6% is reported, the highest among inverted perovskite solar cells (PSCs). Only by introducing a secondary amine into the perovskite structure to form MA 1−x DMA x PbI 3 (MA is methylamine and DMA is dimethylamine) are defect density and carrier recombination suppressed to enable record performance. It is also found that the controlled inclusion of DMA increases the hydrophobicity and stability of films in ambient operating conditions: encapsulated devices maintain over 80% of their efficiency following 800 h of operation at the maximum power point, 30 times longer than reported in the best prior inverted PSCs. The unencapsulated devices show record operational stability in ambient air among PSCs.

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“…[13] Quite notably, PbI 2 /MAI system was the sole manner to fabricate highly efficient solar cells based on mesoporous titania. [19,20] In one of these works, the authors found that the incorporation of chloride led to the suppression of atomic vacancies in perovskite lattice, thus enhancing the ambient-air operational stability of the solar cells. [15] Fortunately, PCEs went up to over 20% within very few years, mostly due to the introduction of the anti-solvent crystallization and passivation strategies on mixed metal cation (Cs, FA, MA) perovskites.…”

Section: Introductionmentioning

confidence: 99%

“…[14] Since then, a race has started when a plethora of methods for solution-processed perovskite films have emerged from the combination of MAI with PbI 2 or PbCl 2 in various device architectures. [19] On the contrary, the vast majority of the published work is based on CsFAMA or FAMA perovskites resulting from precursor sources (PbI 2 , MAI, FAI, CsI) which do not contain any chloride (usually some bromide is typically added to stabilize the perovskite in the form of PbBr 2 and MABr). [16] Nowadays, one can meet only few works on highly performing MAPbI 3 perovskites based on non-iodide lead precursor compounds.…”

Section: Introductionmentioning

confidence: 99%

Μethylammonium Chloride: A Key Additive for Highly Efficient, Stable, and Up‐Scalable Perovskite Solar Cells

Kosmatos

Theofylaktos

Giannakaki

et al. 2019

Energy & Environ Materials

103

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Lead halide perovskites of the type APbX3 (where A = methylammonium MA, formamidinium FA, or cesium and X = iodide and bromide), in a single‐crystal form or more often as polycrystalline films, have already shown unique optoelectronic properties, comparable with those of the best single‐crystal semiconductors. To form a properly crystalline iodide or iodide/bromide, perovskite and achieve high performance in solar cells, sources containing only iodide and bromide salts (PbI2, PbBr2, MAI, FAI, CsI, MABr) are typically used as precursor materials. However, recently, most of the record perovskites contain MACl as additive to control their crystallization, revisiting the importance of methylammonium cation excess and chloride incorporation in perovskites, previously highlighted by Snaith's group back in 2012. Here, we review the background and recent progress in MACl‐mediated crystallization of perovskites, as well as the impact of the additive in solar cells. In particular, we describe the current understanding of the mechanism of perovskite crystallization process and defect passivation at grain boundaries in the presence of MACl. We then discuss the spectacular results (in terms of record efficiencies, stability, and up‐scaling) that have been delivered by solar cells employing MACl‐incorporated perovskites, and give an outlook of future research avenues that might bring perovskite solar cells closer to commercialization.

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Suppression of atomic vacancies via incorporation of isovalent small ions to increase the stability of halide perovskite solar cells in ambient air

Cited by 631 publications

References 66 publications

Defect‐Type‐Dependent Near‐Infrared‐Driven Photocatalytic Bacterial Inactivation by Defective Bi₂S₃ nanorods

Defect‐Type‐Dependent Near‐Infrared‐Driven Photocatalytic Bacterial Inactivation by Defective Bi₂S₃ nanorods

Efficient and Stable Inverted Perovskite Solar Cells Incorporating Secondary Amines

Μethylammonium Chloride: A Key Additive for Highly Efficient, Stable, and Up‐Scalable Perovskite Solar Cells

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Suppression of atomic vacancies via incorporation of isovalent small ions to increase the stability of halide perovskite solar cells in ambient air

Cited by 631 publications

References 66 publications

Defect‐Type‐Dependent Near‐Infrared‐Driven Photocatalytic Bacterial Inactivation by Defective Bi2S3 nanorods

Defect‐Type‐Dependent Near‐Infrared‐Driven Photocatalytic Bacterial Inactivation by Defective Bi2S3 nanorods

Efficient and Stable Inverted Perovskite Solar Cells Incorporating Secondary Amines

Μethylammonium Chloride: A Key Additive for Highly Efficient, Stable, and Up‐Scalable Perovskite Solar Cells

Contact Info

Product

Resources

About

Defect‐Type‐Dependent Near‐Infrared‐Driven Photocatalytic Bacterial Inactivation by Defective Bi₂S₃ nanorods

Defect‐Type‐Dependent Near‐Infrared‐Driven Photocatalytic Bacterial Inactivation by Defective Bi₂S₃ nanorods