High efficiency photoluminescence from silicon nanocrystals prepared by plasma synthesis and organic surface passivation

2006 ◽  
Vol 3 (11) ◽  
pp. 3975-3978 ◽  
Author(s):  
L. Mangolini ◽  
D. Jurbergs ◽  
E. Rogojina ◽  
U. Kortshagen
Keyword(s):  
Silicon Nanocrystals ◽  
High Efficiency ◽  
Surface Passivation ◽  
Plasma Synthesis

Plasma Synthesis and Surface Passivation of Silicon Quantum Dots with Photoluminescence Quantum Yields higher than 60%

2006 ◽  
Vol 934 ◽  
Author(s):  
Lorenzo Mangolini ◽  
David Jurbergs ◽  
Elena Rogojina ◽  
Uwe Kortshagen
Keyword(s):  
Quantum Dots ◽  
Silicon Nanocrystals ◽  
Room Temperature ◽  
Surface Passivation ◽  
Organic Ligands ◽  
Quantum Yields ◽  
Plasma Synthesis ◽  
Silicon Quantum Dots ◽  
Chemical Surface ◽  
Wet Chemical

ABSTRACTSilicon nanocrystals with diameters of less than 5 nm show efficient room temperature pho-toluminescence (PL). Previous reports of PL quantum yields for ensembles of silicon quantum dots have usually been in the few percent range, and generally less than 30%. Here we report the plasma synthesis of silicon quantum dots and their subsequent wet-chemical surface passivation with organic ligands while strictly excluding oxygen. Photoluminescence quantum yields as high as 62% have been achieved at peak wavelengths of about 789 nm.

scholarly journals Design of Grating Al2O3 Passivation Structure Optimized for High-Efficiency Cu(In,Ga)Se2 Solar Cells

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4849
Author(s):  
Chan Hyeon Park ◽  
Jun Yong Kim ◽  
Shi-Joon Sung ◽  
Dae-Hwan Kim ◽  
Yun Seon Do
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Surface Passivation ◽  
Rear Surface ◽  
Maximum Efficiency ◽  
Structural Factors ◽  
Carrier Recombination ◽  
Cigs Solar Cells ◽  
Effective Carrier ◽  
Opening Width

In this paper, we propose an optimized structure of thin Cu(In,Ga)Se2 (CIGS) solar cells with a grating aluminum oxide (Al2O3) passivation layer (GAPL) providing nano-sized contact openings in order to improve power conversion efficiency using optoelectrical simulations. Al2O3 is used as a rear surface passivation material to reduce carrier recombination and improve reflectivity at a rear surface for high efficiency in thin CIGS solar cells. To realize high efficiency for thin CIGS solar cells, the optimized structure was designed by manipulating two structural factors: the contact opening width (COW) and the pitch of the GAPL. Compared with an unpassivated thin CIGS solar cell, the efficiency was improved up to 20.38% when the pitch of the GAPL was 7.5–12.5 μm. Furthermore, the efficiency was improved as the COW of the GAPL was decreased. The maximum efficiency value occurred when the COW was 100 nm because of the effective carrier recombination inhibition and high reflectivity of the Al2O3 insulator passivation with local contacts. These results indicate that the designed structure has optimized structural points for high-efficiency thin CIGS solar cells. Therefore, the photovoltaic (PV) generator and sensor designers can achieve the higher performance of photosensitive thin CIGS solar cells by considering these results.

scholarly journals Surface Passivation of Organometal Halide Perovskite by Atomic Layer Deposition: a Mechanism Investigation Enabling Efficient Inverted Planar Solar Cells

2021 ◽  
Author(s):  
Ran Zhao ◽  
Kai Zhang ◽  
Jiahao Zhu ◽  
Shuang Xiao ◽  
Wei Xiong ◽  
...  
Keyword(s):  
Solar Cells ◽  
Atomic Layer Deposition ◽  
High Efficiency ◽  
Surface Passivation ◽  
Perovskite Solar Cells ◽  
Wide Band ◽  
Atomic Layer ◽  
Layer Deposition ◽  
Halide Perovskite ◽  
Interface Passivation

Interface passivation is of the pivot to achieve high-efficiency organic metal halide perovskite solar cells (PSCs). Atomic layer deposition (ALD) of wide band gap oxides has recently shown great potential...

Comparative Optical Studies of Chemically Synthesized Silicon Nanocrystals

1996 ◽  
Vol 452 ◽  
Author(s):  
Gildardo R. Delgado ◽  
Howard W.H. Lee ◽  
Susan M. Kauzlarich ◽  
Richard A. Bley
Keyword(s):  
Porous Silicon ◽  
Silicon Nanocrystals ◽  
Surface Passivation ◽  
Theoretical Calculations ◽  
Dominant Role ◽  
Blue Emission ◽  
Surface States ◽  
Si Nanocrystals ◽  
Optical And Electronic Properties ◽  
Passivation Layers

AbstractWe studied the optical and electronic properties of silicon nanocrystals derived from two distinct fabrication procedures. One technique uses a controlled chemical reaction. In the other case, silicon nanocrystals are produced by ultrasonic fracturing of porous silicon layers. We report on the photoluminescence, photoluminescence excitation, and absorption spectroscopy of various size distributions derived from these techniques. We compare the different optical properties of silicon nanocrystals made this way and contrast them with that observed in porous silicon. Our results emphasize the dominant role of surface states in these systems as manifested by the different surface passivation layers present in these different fabrication techniques. Experimental absorption measurements are compared to theoretical calculations with good agreement. Our results provide compelling evidence for quantum confinement in both types of Si nanocrystals. Our results also indicate that the blue emission from very small Si nanocrystals corresponds to the bandedge emission, while the red emission arises from traps.

Advances in Surface Passivation Schemes for High Efficiency c-Silicon Solar Cells

2016 ◽  
Vol 16 (10) ◽  
pp. 10659-10664 ◽  
Author(s):  
Nagarajan Balaji ◽  
Cheolmin Park ◽  
Seunghwan Lee ◽  
Youn-Jung Lee ◽  
Junsin Yi
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Surface Passivation ◽  
Silicon Solar Cells

Al2O3/SiON stack layers for effective surface passivation and anti-reflection of high efficiency n-type c-Si solar cells

2017 ◽  
Vol 32 (2) ◽  
pp. 025005 ◽  
Author(s):  
Huong Thi Thanh Nguyen ◽  
Nagarajan Balaji ◽  
Cheolmin Park ◽  
Nguyen Minh Triet ◽  
Anh Huy Tuan Le ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Surface Passivation ◽  
Effective Surface ◽  
Si Solar Cells ◽  
Type C

Surface Passivation Materials for High-Efficiency Silicon Solar Cells

2020 ◽  
pp. 413-441
Author(s):  
Shui-Yang Lien ◽  
Chia-Hsun Hsu ◽  
Xiao-Ying Zhang ◽  
Pao-Hsun Huang
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Surface Passivation ◽  
Silicon Solar Cells

scholarly journals Double‐Sided Surface Passivation of 3D Perovskite Film for High‐Efficiency Mixed‐Dimensional Perovskite Solar Cells

2019 ◽  
Vol 30 (7) ◽  
pp. 1907962 ◽  
Author(s):  
Md Arafat Mahmud ◽  
The Duong ◽  
Yanting Yin ◽  
Huyen T. Pham ◽  
Daniel Walter ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Surface Passivation ◽  
Perovskite Solar Cells

scholarly journals Anodic oxidations: Excellent process durability and surface passivation for high efficiency silicon solar cells

2019 ◽  
Vol 203 ◽  
pp. 110155
Author(s):  
N.E. Grant ◽  
T.C. Kho ◽  
K.C. Fong ◽  
E. Franklin ◽  
K.R. McIntosh ◽  
...  
Keyword(s):  
Solar Cells ◽  
High Efficiency ◽  
Surface Passivation ◽  
Silicon Solar Cells
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