Identification of the physical origin behind disorder, heterogeneity, and reconstruction and their correlation with the photoluminescence lifetime in hybrid perovskite thin films

Berhe, Taame Abraha; Cheng, Ju‐Hsiang; Su, Wei‐Nien; Pan, Chun‐Jern; Tsai, Meng‐Che; Chen, Hung-Ming; Yang, Zhenyu; Hui‐min, Tan; Chen, Ching‐Hsiang; Yeh, Min–Hsin; Tamirat, Andebet Gedamu; Huang, Shiuh‐Jer; Chen, Liang‐Yih; Lee, Jyh‐Fu; Liao, Yen Fa; Sargent, Edward H.; Dai, Hongjie; Hwang, Bing‐Joe

doi:10.1039/c7ta04615d

Cited by 15 publications

(6 citation statements)

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“…The higher responses correspond to some grains although the overall responses are lower than illumination condition. This can be originated from different activation energy of iodide and bromide and their migration in grains with different sizes in the film, resulting from heterogeneously compositional difference, chemical segregation, and defect states due to solution processing. − …”

Section: Resultsmentioning

confidence: 99%

Exploring Responses of Contact Kelvin Probe Force Microscopy in Triple-Cation Double-Halide Perovskites

et al. 2021

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Hybrid organic−inorganic perovskite (HOIP) solar cells have undergone unprecedentedly rapid improvement in power conversion efficiencies during the last decade, but controversy remains regarding the role of local phenomena and heterogeneity in grain by grain. These challenges in turn necessitate understanding the fundamental mechanisms operating at individual grains and exploring how these mechanisms give rise to the collective behaviors of the films. Although numerous efforts have targeted local phenomena in these materials using classical scanning probe microscopy modalities, the measurements remain difficult to interpret due to intrinsic coupling between possible ferroelectric, ion migration, bulk and surface electrochemical phenomena, and the effects of light on these behaviors. Here, we explore the electromechanical responses in (Cs 0.05 FA 0.85 MA 0.15 )Pb(I 0.85 Br 0.15 ) 3 perovskite thin film in the dark and under illumination using band excitation-piezoresponse force microscopy (BE-PFM). To identify and separate ferroic, electrostatic, and electrochemical responses, we utilize contact-Kelvin probe force microscopy (cKPFM). The cKPFM responses show weak variability with morphological features in the dark, while such variability significantly increases under illumination. Deconvolution of the cKPFM responses via principal component analysis (PCA) shows heterogeneity in grain to grain possibly due to variation in migration and segregation of halide ions in mixed perovskites at specific grains. Further, we propose an electrostatic mechanism based on the physics of semiconductors, which can directly link the observed cKPFM behaviors with the ionic and electronic density of states (DOS) and their time dynamics. These findings suggest that cKPFM is a powerful probe of local ionic behaviors on the nanoscale, both in HOIPs and other materials.

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Section: Resultsmentioning

confidence: 99%

Exploring Responses of Contact Kelvin Probe Force Microscopy in Triple-Cation Double-Halide Perovskites

et al. 2021

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“…2(d The observed increased PL yield and faster recombination rate can be explained in terms of a certain structural and chemical modifications of the MAPbI 3 film remained after laser patterning. Pre vious studies on strong laser irradiation of MAPbI 3 concluded that its surface layer always contained excess of PbI 2 [8,9]. Such modification is highly possible considering that sublimation of methyl ammonium proceeds at temperature above 160 o that can be easily reached within the laserirradiated section of the MAPbI 3 film.…”

Section: Methodsmentioning

confidence: 99%

Defects and Morphology Contribution to Photoluminescence of CH3NH3PbI3 Nanostructured by Femtosecond Laser Pulses

Tonkaev

Zhizhchenko

Gets

et al. 2020

SSP

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Despite basic optoelectronic properties of metal-organic perovskites are quite robust to defects, thelatter affect performance of related photovoltaic devices made of such promising materials. Recently,direct femtosecond projection lithography appeared as prospective tool for high-performing nondestructivenano- and microstructuring of perovskite films. Here, we study in details how defects affectthe photoluminescence properties of CH3NH3PbI3 hybrid perovskite films patterned with single- andmulti-pulse irradiation with flat-top femtosecond laser pulses. Scanning electron, wide-field multiphoton,photoluminescence and laser confocal microscopies being combined with photoluminescencedecay measurements are carried out for these studies. The obtained experimental results are analyzedwith a model for carriers kinetics allowed to determine contributions from radiative and non-radiative processes.

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“…Unlike their encouraging efficiency, lead and tin based perovskite solar cells faced from both the toxicity of Pb metal and device instability [73][74][75], which limit the practical applications. Consequently, a great deal has been dedicated to the look for alternative perovskite materials such as lead and tin free halide double perovskites and lead and tin free all inorganic perovskites [76][77][78][79][80][81].…”

Section: Challenges In Lead and Tin Free All-inorganic Halide Double ...mentioning

confidence: 99%

Cs2AgBiBr6 and Cs2TiBr6 Perovskite Solar Cells: The Challenges and Research Roadmap for Power Conversion Efficiency Improvement

Berhe,

Ashebir,

Abay

2024

Preprint

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The stability issues in the widely known organic inorganic halide perovskite, CH3NH3PbI3, lead to the development of alternative halide double perovskite materials which get great attention in recent times. Although the stability issue seems promising, both materials and device performance of these photovoltaic materials remain inferior and challenging for improvements. Furthermore, the power conversion efficiency of single junction organic inorganic halide perovskite is now 24.2% and 29.15% for textured monolithic perovskite/silicon tandem solar cell, but for all-inorganic halide perovskite solar cell is 7.11% and halide double perovskite solar cells based on Cs2AgBiBr6 and Cs2TiBr6 is 2.8% and 3.3%, respectively, which is far less than 24.2% and 29.15%, respectively. This creates big question and concern that can both all-inorganic halide perovskite solar cell and halide double perovskites solar cells really be an acceptable alternatives to replace organic inorganic halide perovskite solar cells or lead based perovskite solar cells in the market in order to realize the practical applications? Not only this concern, but also there are many other big challenges facing by halide double perovskite solar cells. Such big challenges include: a) geometric constraints and limited integration with interfacial materials, b) dynamic disorder and a wide bandgap and localized conduction band caused by cubic unit cell which restrains the interactions of orbitals, c) high processing temperature which may limit on the diverse applications, d) low electronic dimensionality making them less appropriate for single junction solar cell purpose and etc. Moreover, origin of electronic and optical properties such as the polarizability, the presence of molecular dipoles and their influence on the dynamics of the photo-excitations in the halide double perovskites remains unlock concern that need to be elucidated. Now, another big question is how to develop overcoming mechanisms for such challenges. Can we really overcome these current limitations faced by halide double perovskites so that we use them for commercialization? This research roadmap for performance improvement is suggested focusing on: materials surface and bulk engineering, bandgap engineering, interfacial engineering, composition engineering, doping engineering, device architectural engineering, polar and domain order engineering. This was the reason that this review was developed in order to forward great contributions to the readers and commercial ventures.

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Identification of the physical origin behind disorder, heterogeneity, and reconstruction and their correlation with the photoluminescence lifetime in hybrid perovskite thin films

Abstract: Organolead halide perovskites are interesting light-absorbing materials for solar cells and light-emitting devices.

Cited by 15 publications

References 50 publications

Exploring Responses of Contact Kelvin Probe Force Microscopy in Triple-Cation Double-Halide Perovskites

Exploring Responses of Contact Kelvin Probe Force Microscopy in Triple-Cation Double-Halide Perovskites

Defects and Morphology Contribution to Photoluminescence of CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> Nanostructured by Femtosecond Laser Pulses

Cs2AgBiBr6 and Cs2TiBr6 Perovskite Solar Cells: The Challenges and Research Roadmap for Power Conversion Efficiency Improvement

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