Technology

Publications of 2019. Reference to: AAA Solar Simulator, QE-R Quantum Efficiency Measurement, and Luminescence Measurement System. The publications referencing AAA Solar Simulator Boosting the ultra-stable unencapsulated perovskite solar cells by using montmorillonite/CH3NH3PbI3 nanocomposite as photoactive layer. Hsin-Hsiang Huang, Yen-Chen Shih, Leeyih Wang and King-Fu Lin Energy & Environmental Science, Issue 4, 2019. Boosting efficiency of planar heterojunction perovskite solar cells...

Research led by Prof. Honhzheng Chen from Zhejiang University fabricated 2D perovskite films with high efficiency. The fabrication of high quality film with large grains oriented grown along the direction of film thickness is of great importance for the two‐dimensional (2D) Ruddlesden‐Popper perovskite‐based solar cells (PVSCs) with high power conversion efficiency (PCE). In this work, for the first time, the team realized the fabrication of high quality 2D BA2MAn‐1PbnI3n+1 (BA+ = butylammon...

Understanding the I-V characteristic of the internal structure of device is fundamental to develop a highly efficient and highly stable solar cell. When measuring I-V characteristic in a p-n diode one needs to consider the diffusion current, recombination current and series resistance effects, which could result in the device’s performance. Therefore, researchers could know whether the device is parallel to an ideal diode by calculating the ideality factor η. The ideality factor η is a numbe...

Materials scientists from the Soochow University in China have fabricated all-polymer solar cells (all-PSCs) with 11.2% high efficiency. Among various strategies to develop the high efficiency conjugated donor polymers, the substitution of fluorine atoms on the conjugated polymer backbone has attracted considerable attention recently, due to the simultaneous lowering of the highest occupied molecular orbital (HOMO) without sacrificing the bandgap, enhanced molecular ordering, high extinction c...

The future of perovskites breathtaking. Recently material scientist from North China Electric Power University developed the new planer p-n homojunction perovskite solar cells with highly efficiency of 21.3%. The research led by Prof. Meicheng Li was published in Nature Energy, and the same time, Ji-Sang Park, Shooter International Fellow in Royal Society and Aron Walsh, Department of Materials, Imperial College London, have commented that the finding open the way for perovskite solar cells. P...

In an advance that makes more efficient in organic photovoltaics (OPVs), University of Central South researchers, Prof. Yingping Zou have developed non-fullerene acceptor organic photovoltaics (NFA-OPV) devices that can achieve 15.7% efficiency. The research was published in Joule and has been heated discussion on the OPVs field. Before that research came out, Prof. Yingping Zou cooperated with Prof. Yang Yang from UCLA, and Prof. Feng Gao from Linköping University reported a successful strateg...

Prof. Qi Chen, Beijing Institute of Technology, and Prof. Huanping Zhou, Peking University, and Prof. Lijun Zhang, Jilin University, and other materials scientists have developed the high efficiency perovskite films with 20.7 % PCEs, which is certified by NIM, China, by modulating the status of residual strains in controllable manner via rational strain engineering. The mixed halide perovskites have emerged as outstanding light absorbers for efficient solar cells. But it reveals inhomogeneity i...

A team led by Prof. Zhijun Ning, the School of Physical Science and Technology at ShanghaiTech University, fabricated a Sn-based hierarchy structure perovskite in a one-step process, comprising highly parallel-orientation 2D PEA2Snl4 on the surface of 3D FASnl3. The hierarchy structure delivers significant enhanced stability and oxidation resistance in air atmosphere. They have developed a Sn-based perovskite films in planar structure solar cells and achieved a PCE up to 9.41 %. The final paper:...

To improve the brightness, contrast and resolution of the display, while reducing costs and the usage of limited resources, scientists have developed different kinds of light-emitting diodes, such as organic light-emitting diodes (OLEDs), quantum dots LEDs (QLEDs), perovskite-based LEDs (PVSK LEDs) and micro LEDs. Compared to OLEDs, which are widely used in high-end consumer-electronics, the external quantum efficiency of perovskite-based LEDs has rapidly been improved from 0.76 % to 20.7 % in...

Scientists at the Department of Polymer Science and Engineering, Zhejiang University have presented a family of near-infrared nonfullerene acceptors (NIR NFA, T1-T4) with fluorinated regioisomeric A–Aπ–D–Aπ–A backbones for constructing efficient single-junction and tandem PSCs with photon response up to 1000 nm. The study “Near-Infrared Electron Acceptors with Fluorinated Regioisomeric Backbone for Highly Efficient Polymer Solar Cells.”, led by Zhejiang University professors Chang-Zhi ...

Traceability Chain NIST detector calibration uncertainty curve Uncertainty in wavelength range is much higher than VIS range due to the UV light intensity is much smaller than VIS range. NIST Special Publication 250-41 (2008) USER Uncertainty curve *ISO GUM Uncertainty evaluation method User Uncertainty Budget Index Type Component of Uncertainty 1 ...

Who is the winner in the high efficiency contest of LED devices? Light-emitting diodes (LEDs) are the main alternative to traditional light sources, and perovskite light-emitting devices plays the key role in the light-emitting field. Although it is not so easy to get into the light-emitting device field; however, LEDs based on metal halide perovskite materials have extraordinary characteristics: narrow emission line widths at high photo-luminescence quantum yield (PLQY), high color purity...