Solvent Recrystallization‐Enabled Green Amplified Spontaneous Emissions with an Ultra‐Low Threshold from Pinhole‐Free Perovskite Films

Yin, Liang; Shang, Qiuyu; Li, Meili; Zhang, Shuai; Liu, Xinfeng; Zhang, Qing

doi:10.1002/adfm.202106108

Cited by 42 publications

(23 citation statements)

References 64 publications

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“…High phase purity and crystallinity with uniform and fewer grain boundaries have been proven to significantly enhance the performance and stability of the device. [91][92][93][94][95] To obtain high-quality perovskite films, the prerequisite is to reduce the density of defects, which critically depends on the underlying substrates on which the perovskites are crystallized. [2,96] Consequently, it is crucial to realize the controllable growth of pinhole-free, continuous perovskite films on substrates with matched energy-level contacts, via band offsets on the contact/perovskite heterojunctions, respectively.…”

Section: Buried Interface Promoted Crystalline Perovskite Formationmentioning

confidence: 99%

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective

Zuo-ning

Wang

Choy

2022

Advanced Energy Materials

145

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Q limit but the opencircuit voltage (V oc ) and fill factor (FF) are still far below the theoretical values. As we know, both V oc and FF relate to charge carrier dynamics including extraction and transport. Therefore, carrier managements including reducing non-radiative carrier recombination (bulk and interface), series or shunt resistance, and improving carrier extraction and transport are critical to further enhance the power conversion efficiency (PCE) of PSCs. In addition to high efficiency, the stability issues in perovskite must be solved before commercialization.From the standpoint of architecture of PSCs, the PSCs are essentially a heterojunction device with a multilayer construction, which consists of perovskite light absorption layer, carrier transport layer (CTL), and electrodes. [25,30] As a result, the rational design and modification of heterojunction interfaces have become key strategies to harness the full potential of PSCs. [31][32][33][34][35] A lack of in-depth understanding of the heterojunction interfaces and appropriate interface designs, specifically the buried interfaces under polycrystalline perovskite films, is impeding further advancements in perovskite photovoltaic performance and stability. [36][37][38][39][40][41][42] To date, many researches mainly focus on the top surfaces of perovskite. [43][44][45][46][47] However, due to the accumulation of deep-level trap states, it is known that unfavorable non-radiative recombination losses that impede device power outputs exist at the interfaces with bottom contact layers. [41,48] Consequently, it is urgently needed to compromise between these detrimental effects and beneficial effects.However, investigating these issues is more difficult compared with that on the top surfaces of perovskite. There are two kinds of techniques to study the buried interface, which are the in-situ and ex-situ methods. For in-situ method, the sum frequency generation (SFG) vibrational spectroscopy which is a nonlinear interface sensitive spectroscopy is applied to study/ analyze the molecular structure information at the buried interface. [49,50] In addition, the photoluminescence spectroscopy (PL) excited from the glass side can characterize carrier dynamics behavior of buried interface. [51] For ex-situ strategy, the buried interface will expose with a peeling-off method. Then the common characterization methods can be used to analyze exposed the buried surface of perovskite layer, such as PL, scanning electron microscope (SEM), atomic force microscopy (AFM), and Fourier transform infrared spectroscopy (FTIR). [52,53] It is still challenging to find ways to access the buried interfaces to achieve device efficiency limits. [54] Organic-inorganic hybrid perovskite solar cells (PSCs) are promising thirdgeneration solar cells. They exhibit high power conversion efficiency (PCE) and, in theory, can be manufactured with less energy than several more established photovoltaic technologies, particularly solution-processed PSCs. Various materials have been widely utiliz...

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Section: Buried Interface Promoted Crystalline Perovskite Formationmentioning

confidence: 99%

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective

Zuo-ning

Wang

Choy

2022

Advanced Energy Materials

145

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“…Several approaches have been proposed for the deposition of bulk all-inorganic halide perovskite active layers, among which, the solution-processing of precursors spin-coated on a substrate is the most common technique [ 25 , 26 , 27 , 28 , 29 ]. This is an easy, relatively fast, room temperature process, not requiring specific deposition conditions such as vacuum.…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Amplified Spontaneous Emission in CsPbBr3 Thin Films Deposited by Single-Step RF-Magnetron Sputtering

et al. 2023

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Due to their high optical efficiency, low-cost fabrication and wide variety in composition and bandgap, halide perovskites are recognized nowadays as real contenders for the development of the next generation of optoelectronic devices, which, among others, often require high quality over large areas which is readily attainable by vacuum deposition. Here, we report the amplified spontaneous emission (ASE) properties of two CsPbBr3 films obtained by single-step RF-magnetron sputtering from a target containing precursors with variable compositions. Both the samples show ASE over a broad range of temperatures from 10 K up to 270 K. The ASE threshold results strongly temperature dependent, with the best performance occurring at about 50 K (down to 100 µJ/cm2), whereas at higher temperatures, there is evidence of thermally induced optical quenching. The observed temperature dependence is consistent with exciton detrapping up to about 50 K. At higher temperatures, progressive free exciton dissociation favors higher carrier mobility and increases trapping at defect states with consequent emission reduction and increased thresholds. The reported results open the way for effective large-area, high quality, organic solution-free deposited perovskite thin films for optoelectronic applications, with a remarkable capability to finely tune their physical properties.

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“…[22][23][24][25][26] These outstanding properties make such materials ideal candidates for photovoltaics, photodetectors, light-emitting diodes (LEDs) and lasers. [27][28][29][30][31][32] The 3D lead halide is describable by the chemical formula APbX 3 , where A is a small organic cation of methylammonium (MA + ), formamidinium (FA + ) or an inorganic cation of Cs + , while X is the halide ion Cl À , Br À or I À . By the introduction of large organic cations, such as phenylethylamine (PEA + ), 1-naphthylmethylamine (NMA + ) and butylamine (BA + ), the 2D or quasi-2D perovskite that is formed has the formula L 2 A nÀ1 Pb n X 3n+1 , where L is a large organic cation.…”

Section: Introductionmentioning

confidence: 99%

Mode-locking operation of an Er-doped fiber laser with (PEA)₂(CsPbBr₃)_n−1PbBr₄ perovskite saturable absorbers

Yang

et al. 2022

J. Mater. Chem. C

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Solvent Recrystallization‐Enabled Green Amplified Spontaneous Emissions with an Ultra‐Low Threshold from Pinhole‐Free Perovskite Films

Cited by 42 publications

References 64 publications

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective

Temperature-Dependent Amplified Spontaneous Emission in CsPbBr3 Thin Films Deposited by Single-Step RF-Magnetron Sputtering

Mode-locking operation of an Er-doped fiber laser with (PEA)₂(CsPbBr₃)_n−1PbBr₄ perovskite saturable absorbers

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Solvent Recrystallization‐Enabled Green Amplified Spontaneous Emissions with an Ultra‐Low Threshold from Pinhole‐Free Perovskite Films

Cited by 42 publications

References 64 publications

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective

Buried Interface Modification in Perovskite Solar Cells: A Materials Perspective

Temperature-Dependent Amplified Spontaneous Emission in CsPbBr3 Thin Films Deposited by Single-Step RF-Magnetron Sputtering

Mode-locking operation of an Er-doped fiber laser with (PEA)2(CsPbBr3)n−1PbBr4 perovskite saturable absorbers

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Mode-locking operation of an Er-doped fiber laser with (PEA)₂(CsPbBr₃)_n−1PbBr₄ perovskite saturable absorbers