Effect of perovskite film morphology on device performance of perovskite light-emitting diodes

Nanoscale ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 1505-1514 ◽  
Author(s):  
Jae Choul Yu ◽  
Jong Hyun Park ◽  
Sang Yun Lee ◽  
Myoung Hoon Song
Keyword(s):  
Light Emitting Diodes ◽  
Device Performance ◽  
Film Morphology ◽  
Interface Engineering ◽  
Morphological Control ◽  
Light Emitting ◽  
Term Stability ◽  
Long Term Stability

The device performance and long-term stability of perovskite light-emitting diodes (PeLEDs) can be improved by morphological control of perovskite films such as film modification, interface engineering, and quasi 2D.

Simultaneous enhancement in performance and UV-light stability of organic–inorganic perovskite solar cells using a samarium-based down conversion material

2019 ◽  
Vol 7 (1) ◽  
pp. 322-329 ◽  
Author(s):  
Naveed Ur Rahman ◽  
Wasim Ullah Khan ◽  
Wenlang Li ◽  
Shaukat Khan ◽  
Javid Khan ◽  
...  
Keyword(s):  
Solar Cells ◽  
Uv Light ◽  
Perovskite Solar Cells ◽  
Device Performance ◽  
Inorganic Perovskite ◽  
Term Stability ◽  
Long Term Stability ◽  
Light Stability ◽  
Down Conversion

A samarium-based down conversion material was employed to simultaneously improve the device performance and long-term stability of perovskite solar cells.

A highly robust and stable graphene-encapsulated Cu-grid hybrid transparent electrode demonstrating superior performance in organic solar cells

2018 ◽  
Vol 6 (48) ◽  
pp. 24805-24813 ◽  
Author(s):  
Gyujeong Jeong ◽  
Seungon Jung ◽  
Yunseong Choi ◽  
Junghyun Lee ◽  
Jihyung Seo ◽  
...  
Keyword(s):  
Solar Cells ◽  
Organic Solar Cells ◽  
Transparent Electrode ◽  
Superior Performance ◽  
Device Performance ◽  
Transparent Electrodes ◽  
Term Stability ◽  
Long Term Stability

Organic solar cells fabricated with Cu grid/graphene hybrid transparent electrodes exhibit both excellent device performance and long-term stability.

scholarly journals Mobile ions determine the luminescence yield of perovskite light-emitting diodes under pulsed operation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Naresh Kumar Kumawat ◽  
Wolfgang Tress ◽  
Feng Gao
Keyword(s):  
Light Emitting Diodes ◽  
Operation Mode ◽  
Visible Light Communication ◽  
Transient Effects ◽  
Low Frequencies ◽  
Light Emitting ◽  
Long Term Stability ◽  
Electroluminescence Intensity ◽  
Mobile Ions

AbstractThe external quantum efficiency of perovskite light-emitting diodes (PeLEDs) has advanced quickly during the past few years. However, under pulsed operation, an operation mode which is important for display and visible light communication, the performance of PeLEDs changes a lot and requires in-depth understanding to facilitate these applications. Here, we report the response of PeLEDs under pulsed operation in the range of 10 Hz to 20 kHz. Beyond transient effects in the low frequencies, we find that for higher frequencies (>500 Hz) the transient electroluminescence intensity depends strongly on the duty cycle. This feature is much more pronounced and of different origin than that in conventional LEDs. We rationalise our experimental observations using a mathematical model and assign these features to the effect of mobile ionic charges in the perovskite. Our work also provides important implications for the operation of PeLEDs under the steady state, where accumulation of mobile ions at the interfaces could be beneficial for high electroluminescence yields but harmful for the long-term stability.

Improved charge extraction through interface engineering for 10.12% efficiency and stable CsPbBr3 perovskite solar cells

2020 ◽  
Vol 8 (40) ◽  
pp. 20987-20997
Author(s):  
Jingwei Zhu ◽  
Mixue Tang ◽  
Benlin He ◽  
Wenyu Zhang ◽  
Xueke Li ◽  
...  
Keyword(s):  
Solar Cells ◽  
Energy Loss ◽  
Perovskite Solar Cells ◽  
Charge Recombination ◽  
Interface Engineering ◽  
Term Stability ◽  
Long Term Stability ◽  
Charge Extraction

By improving the charge extraction and reducing charge recombination as well as energy loss, interface engineering helps the CsPbBr3 PSC to achieve the best PCE as high as 10.12% and excellent long-term stability.

scholarly journals The Rational Control of Precursor Concentration in Perovskite Light-Emitting Diodes

Crystals ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 60
Author(s):  
Keke Song ◽  
Xiaoping Zou ◽  
Huiyin Zhang ◽  
Jin Cheng ◽  
Chunqian Zhang ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Decisive Role ◽  
Precursor Solution ◽  
Device Performance ◽  
Film Morphology ◽  
Carrier Injection ◽  
Perovskite Layer ◽  
Light Emitting ◽  
High Fluorescence ◽  
Light Color

Perovskite light-emitting diodes (PeLEDs) have attracted tremendous attention due to their ideal optoelectronic properties, such as high color purity, high fluorescence quantum yield, and tunable light color. The perovskite layer plays a decisive role in the performance of PeLEDs and the solvent engineering of the perovskite layer is the key technological breakthrough in preparing high quality films. In this study, we have proposed the strategy of adding different amounts of solvents to the perovskite precursor solution to optimize the morphology of perovskite films and device performance. As a result, with the decreasing concentration of perovskite precursor solution, the perovskite film morphology is smoother and more favorable for carrier injection and combing, which induces an enhanced external quantum efficiency. The maximum luminance of PeLEDs was increased from 1667 cd/m2 to 9857 cd/m2 and the maximum current efficiency was increased from 6.7 cd/A to 19 cd/A. This work provides a trend to achieve improved film morphology and device performance for perovskite optoelectronic devices.

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