Colorless-to-colorful switching of electrochromic MXene by reversible ion insertion

AbstractElectrochromic (EC) materials that change color with voltage have been widely studied for use in dynamic windows. However, colorless-to-colorful switching with high contrast ratio is generically unattainable, especially for colorless-to-black electrochromic materials with an ultrahigh contrast ratio over the entire visible region. In this work, we developed Nb1.33C MXene-based dynamic windows with colorless-to-black switching of up to 75% reversible change in transmittance from 300 to 1,500 nm. By exploring the electrochromic effects of different electrolytes through in situ optical changes and electrochemical quartz crystal microbalance (EQCM), it is found that electrochromic behavior is greatly influenced by the extent of reversible Li+ insertion/deinsertion between the two-dimensional Nb1.33C MXene nanosheets. In addition, a colorless-to-black EC device based on Nb1.33C with an overall integrated contrast ratio over 80% was successfully constructed by a solution-processable spin coating method. This work enables a simple route to fabricate MXene-based high-performance electrochromic smart windows, which is important for further expanding the application of MXenes to optoelectronic and photonic applications.

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Elaboration of Conductive Polymer thin films (P3HT/PCBM) by spin coating method – Application for hybrid organic solar cell

Science and Technology Development Journal ◽

10.32508/stdj.v17i3.1368 ◽

2014 ◽

Vol 17 (3) ◽

pp. 30-40

Author(s):

Son Hoang Cao Tran ◽

Quoc Kien Quoc ◽

Nhan Thuc Chi Ha ◽

Top Khac Le ◽

Thang Bach Phan ◽

...

Keyword(s):

Thin Film ◽

Solar Cell ◽

Spin Coating ◽

High Performance ◽

Short Circuit ◽

Rotational Velocity ◽

Conductive Polymer ◽

Spin Coating Method ◽

Donor And Acceptor ◽

Coating Method

The nanostructured polymer-fullerene thin film is one of the most prominent materials to make the hybrid bulk heterojunction solar cell (BHJ) with high conversion efficiency. Especially when the blend of P3HT and PCBM was used as the donor and acceptor materials. The properties of P3HT and PCBM layer in solar cell has been much studied and considered as high performance systems. One of the important factors for the high performance device is the fabrication of photo active layer with the appropriate thickness and morphology. In the ideal case, the intermolecular distance between the polymer and fullerene should be approximately 10-20 nm (the exciton diffusion distance) giving an area of extensive contact between the two phases. After the dissociation of carriers, the two polymer phases should create the path way for carriers to reach electrodes. But so far, this ideal configuration has not been published. In this work, we’ve elaborated the P3HT and PCBM photo active layers by spin coating methodon glass substrates covered ITO electrode. The rotational velocity was determined to get the necessary effective thickness of the polymer film. The annealing effect on structure, optical and electrical properties of the polymer thin film with different content of PCBM were also investigated. The experiments show the best device on electrode ITO has I-V characteristic as a photodiode and short circuit current (Isc) aboutmili-Ampere. These results demonstrate convincingly that polymer layers elaborated by spin coating method can result a good performance of the device.

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Improvement QCM Quality By Polystyrene Coating and Bovine Serum Albumin as Immobilization Agent

Jurnal Ilmiah Pendidikan Fisika Al-Biruni ◽

10.24042/jipfalbiruni.v8i1.3716 ◽

2019 ◽

Vol 8 (1) ◽

pp. 35-41 ◽

Cited By ~ 1

Author(s):

Lalu A. Didik ◽

Yahdi Yahdi ◽

Masruroh Masruroh

Keyword(s):

Thin Film ◽

Bovine Serum Albumin ◽

Serum Albumin ◽

Spin Coating ◽

Bovine Serum ◽

Quartz Crystal ◽

Measuring System ◽

Frequency Shifts ◽

Impedance Analyzer ◽

Coating Method

Polystyrene (PS) thin film with various concentration of mass (1%, 3%, and 5%) has been deposited onto Quartz Crystal Microbalance (QCM) surface by a spin coating method. The purpose of this research is the improvement of Bovine Serum Albumin (BSA) immobilization into the QCM surface. The QCM resonance frequency has been investigated by means of Impedance Analyzer. The film thickness was calculated by the Sauerbrey equation. The surface roughness of the PS layer was observed by noncontact Topography Measuring System (TMS-1200). Calculation result using a Sauerbrey equation shows the thickness of the PS layer increases with the increasing PS concentration. The QCM/PS with 1% and 5% concentration of mass has rougher morphology and more frequency shifts caused by BSA injection compared to 3% concentration of PS

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Additive Modulated Perovskite Microstructures for High Performance Photodetectors

Micromachines ◽

10.3390/mi11121090 ◽

2020 ◽

Vol 11 (12) ◽

pp. 1090

Author(s):

Zhan Gao ◽

Yifan Zheng ◽

Guancheng Huang ◽

Genjie Yang ◽

Xinge Yu ◽

...

Keyword(s):

Molecular Interactions ◽

Dark Current ◽

High Performance ◽

Visible Region ◽

Carbonyl Groups ◽

High Quality ◽

Inorganic Hybrid ◽

Simple Route ◽

High Efficient ◽

Crystallographic Defects

Organic-inorganic hybrid perovskites have been widely used as light sensitive components for high-efficient photodetectors due to their superior optoelectronic properties. However, the unwanted crystallographic defects of perovskites typically result in high dark current, and thus limit the performance of the device. Herein, we introduce a simple route of microstructures control in MAPbI3 perovskites that associates with introducing an additive of 3,3,4,4-benzophenonetetracarboxylic dianhydridean (BPTCD) for crystallization adjustment of the perovskite film. The BPTCD additive can facilitate the formation of high-quality perovskite film with a compact and nearly pinhole-free morphology. Through characterizing the molecular interactions, it was found that the carbonyl groups in BPTCD is the key reason that promoted the nucleation and crystallization of MAPbI3. As a result, we obtained high-efficient and stable perovskite photodetectors with low dark current of 9.98 × 10−8 A at −0.5 V, an on/off ratio value of 103, and a high detectivity exceeding 1012 Jones over the visible region.

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