Technical Articles

Enli Tech endeavors in photovoltaic testing instruments and perovskite solar cells applications, and provides professional and abundant technical articles including:
Perovskite Solar Cell Techniques and Methods
Spectroscopy
Technical Notes

2D perovskite materials could hold key to develop higher efficiency solar cell.

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...

How to analyze the defects in perovskite devices and measure diode ideality factor?

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...

Single junction all-polymer solar cells with high efficiency of 11.2%

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...

Embrace the defects of perovskite, which leads the innovative transformation in solar cells

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...

New Strategy for fullerene-free OPVs: Achieving low voltage loss and high photocurrent

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...

Strain engineering, a new way to break through the efficiency of perovskite

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...

2D-Quasi-2D-3D Hierarchy Structure for Tin Perovskite Solar Cells with Enhanced Efficiency (9.41%) and Stability

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:...

Perovskite-based LEDs are making rapid progress! EQE up to 20.1% comparable to OLEDs

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...

Recent progress in Polymer Solar Cells: Breakthrough Efficiency of 14.64% by optimizing PSC device operation in NIR.

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 ...

Uncertainty Principle

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 ...

The key elements to measure higher efficiency of perovskite LED devices

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...

Solvent-controlled growth of inorganic perovskite films in dry environment for efficient and stable solar cells

Is the inorganic perovskite solar cell a trend in the future? In the highly competitive solar industry, perovskite solar cells have leapt toward commercialization, and challenged the silicon solar cells holding the largest market share at present. Perovskite solar cells have high optical absorption, low cost compared with silicon solar cells, and can be dissolved in solvent and then spray coated directly onto substrate. If its instability and deterioration on exposure to heat problems can ...