scholarly journals Metal oxide charge transfer complex for effective energy band tailoring in multilayer optoelectronics

2022 ◽  
Vol 13 (1) ◽  
Author(s):  
Moohyun Kim ◽  
Byoung-Hwa Kwon ◽  
Chul Woong Joo ◽  
Myeong Seon Cho ◽  
Hanhwi Jang ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Energy Level ◽  
Metal Oxide ◽  
Energy Band ◽  
High Performance ◽  
Charge Transfer Complex ◽  
Effective Energy ◽  
Carrier Injection ◽  
Oxide Charge ◽  
Conductivity Enhancement

AbstractMetal oxides are intensively used for multilayered optoelectronic devices such as organic light-emitting diodes (OLEDs). Many approaches have been explored to improve device performance by engineering electrical properties. However, conventional methods cannot enable both energy level manipulation and conductivity enhancement for achieving optimum energy band configurations. Here, we introduce a metal oxide charge transfer complex (NiO:MoO3-complex), which is composed of few-nm-size MoO3 domains embedded in NiO matrices, as a highly tunable carrier injection material. Charge transfer at the finely dispersed interfaces of NiO and MoO3 throughout the entire film enables effective energy level modulation over a wide work function range of 4.47 – 6.34 eV along with enhanced electrical conductivity. The high performance of NiO:MoO3-complex is confirmed by achieving 189% improved current efficiency compared to that of MoO3-based green OLEDs and also an external quantum efficiency of 17% when applied to blue OLEDs, which is superior to 1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile-based conventional devices.

scholarly journals Perspective on Predominant Metal Oxide Charge Transporting Materials for High-Performance Perovskite Solar Cells

2021 ◽  
Vol 8 ◽  
Author(s):  
Mriganka Singh ◽  
Chih Wei Chu ◽  
Annie Ng
Keyword(s):  
Solar Cells ◽  
Metal Oxide ◽  
Charge Transport ◽  
High Performance ◽  
Collection Efficiency ◽  
Perovskite Solar Cells ◽  
Hole Transport ◽  
Future Research ◽  
Charge Collection Efficiency ◽  
Oxide Charge

Nowadays, the power conversion efficiency of organometallic mixed halide perovskite solar cells (PSCs) is beyond 25%. To fabricate highly efficient and stable PSCs, the performance of metal oxide charge transport layers (CTLs) is one of the key factors. The CTLs are employed in PSCs to separate the electrons and holes generated in the perovskite active layer, suppressing the charge recombination rate so that the charge collection efficiency can be increased at their respective electrodes. In general, engineering of metal oxide electron transport layers (ETLs) is found to be dominated in the research community to boost the performance of PSCs due to the resilient features of ETLs such as excellent electronic properties, high resistance to thermal temperature and moisture, ensuring good device stability as well as their high versatility in material preparation. The metal oxide hole transport layers in PSCs are recently intensively studied. The performance of PSCs is found to be very promising by using optimized hole transport materials. This review concisely discusses the evolution of some prevalent metal oxide charge transport materials (CTMs) including TiO2, SnO2, and NiOx, which are able to yield high-performance PSCs. The article begins with introducing the development trend of PSCs using different types of CTLs, pointing out the important criteria for metal oxides being effective CTLs, and then a variety of preparation methods for CTLs as employed by the community for high-performance PSCs are discussed. Finally, the challenges and prospects for future research direction toward scalable metal oxide CTM-based PSCs are delineated.

High-performance electrochromic films with fast switching times using transparent/conductive nanoparticle-modulated charge transfer

Nanoscale ◽  
2019 ◽  
Vol 11 (38) ◽  
pp. 17815-17830 ◽  
Author(s):  
Junsang Yun ◽  
Yongkwon Song ◽  
Ikjun Cho ◽  
Yongmin Ko ◽  
Cheong Hoon Kwon ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Transition Metal ◽  
Metal Oxide ◽  
High Performance ◽  
Transition Metal Oxide ◽  
Fast Switching ◽  
Switching Times

Facile charge transfer-induced structural/interfacial designs for high-performance transition metal oxide-based electrochromic films.

Tailoring energy level and surface basicity of metal oxide semiconductors by rare-earth incorporation for high-performance formaldehyde detection

2019 ◽  
Vol 6 (7) ◽  
pp. 1767-1774 ◽  
Author(s):  
Yanfang Zhao ◽  
Xiaoxin Zou ◽  
Hui Chen ◽  
Xuefeng Chu ◽  
Guo-Dong Li
Keyword(s):  
Rare Earth ◽  
Energy Level ◽  
Metal Oxide ◽  
Fermi Level ◽  
High Performance ◽  
Metal Oxide Semiconductors ◽  
Oxide Semiconductors ◽  
Surface Basicity

The elevated Fermi level and increased surface basicity of 5Y-In2O3 led to the improvement of response and selectivity towards formaldehyde.

scholarly journals Effect of hybridized local and charge transfer molecules rotation in excited state on exciton utilization

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Gang Sun ◽  
Xin-Hui Wang ◽  
Jing Li ◽  
Bo-Ting Yang ◽  
Ying Gao ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Energy Level ◽  
High Performance ◽  
Density Functional ◽  
Energy Gap ◽  
Energy Levels ◽  
Density Functional Theory Method ◽  
Molecular Structures ◽  
State Potential

AbstractThe fluorescent molecules utilizing hybridized local and charge-transfer (HLCT) state as potential organic light-emitting diodes materials attract extensive attention due to their high exciton utilization. In this work, we have performed the density functional theory method on three HLCT-state molecules to investigate their excited-state potential energy surface (PES). The calculated results indicate the T1 and T2 energy gap is quite large, and the T2 is very close to S1 in the energy level. The large gap is beneficial for inhibiting the internal conversion between T1 and T2, and quite closed S1 and T2 energies are favor for activating the T2 → S1 reverse intersystem crossing path. However, considering the singlet excited-state PES by twisting the triphenylamine (TPA) or diphenylamine (PA) group, it can be found that the TPA or PA group almost has no influence on T1 and T2 energy levels. However, the plots of S1 PES display two kinds of results that the S1 emissive state is dominated by charge-transfer (CT) or HLCT state. The CT emission state formation would decrease the S1 energy level, enlarge the S1 and T2 gap, and impair the triplet exciton utilization. Therefore, understanding the relationship between the S1 PES and molecular structures is important for designing high-performance luminescent materials utilizing HLCT state.

Highly efficient polymer solar cells via multiple cascade energy level engineering

2018 ◽  
Vol 6 (34) ◽  
pp. 9119-9129 ◽  
Author(s):  
Zuojia Li ◽  
Dongsheng Tang ◽  
Zhenkai Ji ◽  
Wei Zhang ◽  
Xiaopeng Xu ◽  
...  
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Energy Level ◽  
High Performance ◽  
Polymer Solar Cells ◽  
Highly Efficient ◽  
Cascade Energy ◽  
Engineering Strategy ◽  
Blend Polymer ◽  
Transfer Channels

High-performance multiple blend polymer solar cells (PSCs) were firstly achieved via a multiple cascade energy level engineering strategy. By introducing more different bandgap copolymers with the similar molecular backbones, steadier energy level alignment and more charge transfer channels in devices could be realized.

scholarly journals Effect of charge-transfer complex on the energy level alignment between graphene and organic molecules

2012 ◽  
Vol 100 (18) ◽  
pp. 183102 ◽  
Author(s):  
Giyeol Bae ◽  
Hyun Jung ◽  
Noejung Park ◽  
Jinwoo Park ◽  
Suklyun Hong ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Energy Level ◽  
Organic Molecules ◽  
Charge Transfer Complex ◽  
Energy Level Alignment
Sign in / Sign up

Export Citation Format

Share Document