Electric and Crystallographic Characterizations on Hydrogen Passivated Spherical Silicon Solar Cells

Okamoto, Chikao; Minemoto, Takashi; Murozono, Mikio; Takakura, Hideyuki; Hamakawa, Yoshihiro

doi:10.1143/jjap.44.7372

Cited by 19 publications

(10 citation statements)

References 35 publications

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“…As reported in previous studies, the diode ideality factor ( A ) is related to electron‐hole recombination in solar cells . As the A value is equal to one, the recombination in the neutral region dominates.…”

Section: Resultsmentioning

confidence: 78%

Effects of ammonia concentration on the formation of CdS fabricated via microwave‐assisted chemical bath deposition

et al. 2017

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The microwave-assisted chemical bath deposition (MACBD) process was successfully developed in this study for the preparation of cadmium sulfide (CdS) films as the buffer layers in Cu(In,Ga)Se 2 solar cells. The MACBD process reduces the reaction time to just 8 min. During the MACBD process, increasing the concentration of NH 4 OH in the solution effectively reduced the thickness of the films as well as the particle sizes of in CdS films. At high NH 4 OH concentrations, the heterogeneous nucleation of CdS dominated, and the formation of films was controlled via the ion-by-ion growth mechanism. Increasing the concentration of NH 4 OH from 1 to 2.5 M significantly increased the conversion efficiency of the fabricated CIGS solar cells from 7.15% to 9.12%. The increase in the efficiency was attributed to an increase in the absorption of incident light and the enhancement of the carrier collection due to a reduction in the thickness of the prepared CdS films. According to diode analysis, the improvement in the diode ideality factor and leakage current was owing to the uniform coverage of CdS films and a reduction in series resistance associated with a decrease in the thickness of CdS films. When the concentration of ammonia was further increased to 3 M, incomplete coverage of CdS films on CIGS layers resulted in the formation of shunt paths and degraded the cell performance. This study demonstrated that CdS films prepared using the MACBD process with the optimum concentration of ammonia effectively improved the photovoltaic performance of Cu(In,Ga)Se 2 solar cells. K E Y W O R D S ammonia concentration, CdS buffer, CIGS solar cell, diode analysis, microwave-assisted chemical bath deposition

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Section: Resultsmentioning

confidence: 78%

Effects of ammonia concentration on the formation of CdS fabricated via microwave‐assisted chemical bath deposition

et al. 2017

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“…Thus, the recombination at GBs could not be observed clearly. The EBIC contrast of the CIGS solar cell was low compared with that of polycrystalline Si solar cells, 11) where a clear EBIC contrast was observed in GBs and crystal grains. The results suggested that there was no significant difference in the number of effective recombination centers between GBs and crystal grains.…”

Section: Resultsmentioning

confidence: 85%

“…The properties of GBs in polycrystalline Si solar cells were often measured by the EBSD and EBIC techniques. [9][10][11][12][13][14][15] In CIGS films, EBSD measurements were performed mostly on the cross sections of CIGS films. [16][17][18][19][20][21] In ref.…”

Section: Introductionmentioning

confidence: 99%

Grain Boundary Character Distribution on the Surface of Cu(In,Ga)Se₂ Thin Film

Minemoto

Wakisaka

Takakura

2011

Jpn. J. Appl. Phys.

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In general, defects in grain boundaries (GBs) in polycrystalline materials form effective recombination centers. However, this is not the case for polycrystalline Cu(In,Ga)Se2 (CIGS) thin films used in solar cells. It is difficult to determine GB properties by electron backscatter diffraction (EBSD) and electron-beam-induced current (EBIC) measurements because of the surface roughness of as-grown CIGS films. In this study, the CIGS film surface was flattened by ion milling, and then the GB character distribution and spatial distribution of electronically active defects were determined by EBSD and EBIC measurements, respectively. Results suggested that flattening the CIGS film surface enabled the measurements of intrinsic GB properties. Moreover, the results revealed that the GB character distribution on the CIGS film surface hardly changed in the band gap energy range less than 1.28 eV.

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“…3,4,[6][7][8][9][10][11][12] Flexible and light weight spherical Si solar cells are also anticipated, and will be valuable in situations such as responding to emergency disasters. The conversion ef ciencies of spherical Si solar cells can be increased by producing high-quality Si spheres, 3,4,[6][7][8][9][10][11][12][13][14][15] forming textured Si surface structures, 16) deactivating defects by passivation, 17) optimizing the concentrator module and re ector cup 18,19) and preparing anti-re ection (AR) lms on the spherical Si solar cells. 12,[20][21][22] Si spheres have typically been grown by a dropping method.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Optical Properties of Silicon Spheres for Solar Cells

et al. 2016

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2Clean Venture 21 Corporation, Japan Silicon (Si) spheres were prepared by a powder melting method, and their microstructures and optical properties were investigated. The lattice constant of the Si spheres increased upon phosphorus (P) diffusion, compared to that before P diffusion. This was attributed to the presence of interstitial P atoms. A uorine-doped tin oxide (SnO x :F y ) anti-re ection lm was then coated on the surface of the Si spheres. Changes in the lattice constant and bandgap of the SnO x :F y lm occurred upon subsequent annealing. This was attributed to changes in the composition of the SnO x :F y lm.

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Electric and Crystallographic Characterizations on Hydrogen Passivated Spherical Silicon Solar Cells

Abstract: An approach towards quantum games is proposed that uses the unusual probabilities involved in EPR-type experiments directly in two-player games.

Cited by 19 publications

References 35 publications

Effects of ammonia concentration on the formation of CdS fabricated via microwave‐assisted chemical bath deposition

Effects of ammonia concentration on the formation of CdS fabricated via microwave‐assisted chemical bath deposition

Grain Boundary Character Distribution on the Surface of Cu(In,Ga)Se₂ Thin Film

Microstructures and Optical Properties of Silicon Spheres for Solar Cells

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Electric and Crystallographic Characterizations on Hydrogen Passivated Spherical Silicon Solar Cells

Abstract: An approach towards quantum games is proposed that uses the unusual probabilities involved in EPR-type experiments directly in two-player games.

Cited by 19 publications

References 35 publications

Effects of ammonia concentration on the formation of CdS fabricated via microwave‐assisted chemical bath deposition

Effects of ammonia concentration on the formation of CdS fabricated via microwave‐assisted chemical bath deposition

Grain Boundary Character Distribution on the Surface of Cu(In,Ga)Se2 Thin Film

Microstructures and Optical Properties of Silicon Spheres for Solar Cells

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Product

Resources

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Grain Boundary Character Distribution on the Surface of Cu(In,Ga)Se₂ Thin Film