Unraveling the Impact of Halide Mixing on Crystallization and Phase Evolution in CsPbX3 Perovskite Solar Cells

Ma, Junjie; Qin, Minchao; Li, Yuhao; Wu, Xiao; Qin, Zhaotong; Wu, Yichu; Fang, Guojia; Lu, Xinhui

doi:10.1016/j.matt.2020.10.023

Cited by 59 publications

(69 citation statements)

References 52 publications

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“…By adopting the insitu GIWAXS characterization method, Ma et al systematically investigated the crystallization and phase evolution processes of CsPbX 3 with various halide compositions. [93] It was found that I, Br, and Cl have a profound effect on phase-transition and crystallization kinetics of all-inorganic perovskite during the crystallization process. Based on the revealed crystallization [84] Copyright 2018, American Chemical Society.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Metal‐Halide Perovskite Crystallization Kinetics: A Review of Experimental and Theoretical Studies

Xie

Xue

Yip

2021

Advanced Energy Materials

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These promising advances in device performance are attributed to successful deployment of the alloying of cation and anion mixtures and the development of engineering approaches to improve the properties of perovskite crystals and films. These include improvements to chemical homogeneity, crystal phase purity/stability, sub-bandgap (trap) states, and thin-film uniformity. [10,11] However, despite this progress, PSCs still suffer from poor stability and their efficiencies remain far from the calculated limit (33.7%). [12,13] To realize high-performance PSCs, a high-quality perovskite film, aligned energy levels and optimal interfacial properties must be present in a single device. [14,15] In particular, high-quality perovskite films are critical to extending the open-circuit-voltage (V oc ) and fill-factor (FF) upper limit of PSCs. [16] However, commonly, perovskites rapidly crystallize from solution to form thin films, and this process may be complete in few seconds, which contributes to the inhomogeneous crystallization process, therefore, compromised film quality. [17] Thus, the manner in which ions crystallize from solution and during film formation is critical to the quality of the resulting perovskite films.A typical chemical composition of MHP is ABX 3 , where A is a monovalent organic cation, such as methylammonium (MA + ) or formamidinium (FA + ), or a monovalent inorganic (metal) cation, such as cesium (Cs + ), B is a divalent metal cation, such as lead (Pb 2+ ) or tin (Sn 2+ ), and X is a halogen anion, such as iodide (I − ), bromide (Br − ), or chloride (Cl − ). [18][19][20] In addition, perovskite precursor materials must meet the requirements of

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Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Metal‐Halide Perovskite Crystallization Kinetics: A Review of Experimental and Theoretical Studies

Xie

Xue

Yip

2021

Advanced Energy Materials

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“…To investigate the LS effect on device performance of all‐inorganic PSCs, we fabricated the CsPb(I 0.8 Br 0.2 ) 3 based PSCs with a device structure of ITO/ZnO/Perovskite/Spiro‐OMeTAD/Au. [ 26 ] Before LS, a typical device showed a relatively low efficiency of 12.58% due to the poor V OC and FF ( Figure a). After about 30 min of LS, the efficiency reached 17.16% with improved V OC and FF.…”

Section: Resultsmentioning

confidence: 99%

Control over Light Soaking Effect in All‐Inorganic Perovskite Solar Cells

Qin

et al. 2021

Adv Funct Materials

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Light soaking (LS) has been reported to positively influence the device performance of perovskite solar cells (PSCs), which, however, could be potentially harmful to the loaded devices due to the unstable output. There are very few reports on controls over the LS effect, especially in all‐inorganic PSCs. In this study, a remarkable LS induced performance enhancement of CsPb(I1−xBrx)3 based PSCs is presented. In situ grazing‐incidence wide‐angle X‐ray scattering measurements quantize the temperature increase under illumination and reveal a radiative heating‐induced lattice expansion. The device curing time is shortened with the increased Br/I ratio, evidently correlated with their distinct mobility and activation energy. It is suggested that LS could promote the migration of halide ions, giving rise to notable defect passivation and thus device improvements. Based on these understandings, an effective means is proposed to suppress the LS effect, which is to incorporate slightly over‐stochiometric PbI2 in precursor, and a champion PCE of 18.14% in all‐inorganic PSCs with significantly reduced device curing time is obtained.

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“…These also indicate that Cl can be doped into I and Br mixed inorganic perovskites, which is consistent with previous reports. [ 34,35 ]…”

Section: Resultsmentioning

confidence: 99%

“…1) The addition of Cl improved stability and suppressed nonradiative recombination, in agreement with the previous reports. [ 34,35 ] 2) The gradient distribution of triple anion inorganic perovskite CsPb(I 0.75 Br 0.25 ) 3− x Cl x layer promoted the carrier transport. [ 36,37 ] The optimized concentration of CTAC solution is 4 × 10 −4 mmol mL −1 by comparing the CTAC‐modified device efficiency with different concentrations (Figure S11, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Hydrophobic Organic Ammonium Halide Modification toward Highly Efficient and Stable CsPbI_2.25Br_0.75 Solar Cell

Duan

Wang

et al. 2021

Solar RRL

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Inorganic cesium lead halide perovskite solar cells are promising candidates for next‐generation photovoltaic applications. However, their phase instability and relatively low efficiency hinder their commercialization. Herein, hydrophobic organic ammonium halides (Cl, Br, and I) are rationally used for the modification of inorganic CsPb(I0.75Br0.25)3 perovskite solar cells. Benefiting from their passivation effects and hydrophobic long alkyl chain, the modified devices exhibit enhanced efficiency and stability. Among them, the hexadecyltrimethylammonium chloride (CTAC)‐modified device shows the best performance with a power conversion efficiency (PCE) of 18.05%. Furthermore, a gradient triple anion inorganic perovskite CsPb(I0.75Br0.25)3−x Cl x layer is formed in situ during the CTAC modification, which demonstrates better phase stability than CsPb(I0.75Br0.25)3. As a result, the modified device also shows excellent stability, maintaining 94% of the initial efficiency after 35 days in N2 atmosphere.

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Unraveling the Impact of Halide Mixing on Crystallization and Phase Evolution in CsPbX3 Perovskite Solar Cells

Cited by 59 publications

References 52 publications

Metal‐Halide Perovskite Crystallization Kinetics: A Review of Experimental and Theoretical Studies

Metal‐Halide Perovskite Crystallization Kinetics: A Review of Experimental and Theoretical Studies

Control over Light Soaking Effect in All‐Inorganic Perovskite Solar Cells

Hydrophobic Organic Ammonium Halide Modification toward Highly Efficient and Stable CsPbI_2.25Br_0.75 Solar Cell

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Unraveling the Impact of Halide Mixing on Crystallization and Phase Evolution in CsPbX3 Perovskite Solar Cells

Cited by 59 publications

References 52 publications

Metal‐Halide Perovskite Crystallization Kinetics: A Review of Experimental and Theoretical Studies

Metal‐Halide Perovskite Crystallization Kinetics: A Review of Experimental and Theoretical Studies

Control over Light Soaking Effect in All‐Inorganic Perovskite Solar Cells

Hydrophobic Organic Ammonium Halide Modification toward Highly Efficient and Stable CsPbI2.25Br0.75 Solar Cell

Contact Info

Product

Resources

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Hydrophobic Organic Ammonium Halide Modification toward Highly Efficient and Stable CsPbI_2.25Br_0.75 Solar Cell