A study on the correlation between the photoinduced volume expansion and the internal stress in hydrogenated amorphous silicon

Sakamoto, Tomonari; Yoshida, Norimitsu; Harada, H; Kishida, Takuya; Nonomura, Shuichi; Gotoh, Tamihiro; Kondo, Michio; Matsuda, Akihisa; Itoh, Taketsugu; Nitta, Shoji

doi:10.1016/s0022-3093(99)00781-4

Cited by 9 publications

(5 citation statements)

References 7 publications

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“…This provides a way of gauging the relative importance of the two types of defects. In experiments on light soaking, a slight increase in the volume of the sample is observed [22], which in our picture is due to an increase in strain. It has also been observed [23,24] that if one removes the strain due to deposition, the SWE is reduced.…”

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confidence: 54%

Microscopic Description of Light Induced Defects in Amorphous Silicon Solar Cells

Wagner

Grossman

2008

Phys. Rev. Lett.

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Using a combination of quantum and classical computational approaches, we model the electronic structure in amorphous silicon in order to gain an understanding of the microscopic atomic configurations responsible for light-induced degradation of solar cells. We demonstrate that regions of strained silicon bonds could be as important as dangling bonds for creating traps for charge carriers. Further, our results show that defects are preferentially formed when a region in the amorphous silicon contains both a hole and a light-induced excitation. These results are consistent with the puzzling dependencies on temperature, time, and pressure observed experimentally.

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confidence: 54%

Microscopic Description of Light Induced Defects in Amorphous Silicon Solar Cells

Wagner

Grossman

2008

Phys. Rev. Lett.

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“…As a matter of fact, there has been a great deal of research on lightinduced volume changes [50]. Various beam bending experiments have been performed using samples consisting of long and narrow pieces of thin glass or quartz substrates coated with a-Si:H [51][52][53][54][55][56][57]. These results reveal that lightinduced volume expansion follows a stretched exponential behavior, usually showing saturation at dV /V ∼ 10 −3 [29].…”

Section: Discussionmentioning

confidence: 99%

Light induced electrical and macroscopic changes in hydrogenated polymorphous silicon solar cells

et al. 2012

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We report on light-induced electrical and macroscopic changes in hydrogenated polymorphous silicon (pm-Si:H) PIN solar cells. To explain the particular light-soaking behavior of such cells -namely an increase of the open circuit voltage (Voc) and a rapid drop of the short circuit current density (Jsc) -we correlate these effects to changes in hydrogen incorporation and structural properties in the layers of the cells. Numerous techniques such as current-voltage characteristics, infrared spectroscopy, hydrogen exodiffusion, Raman spectroscopy, atomic force microscopy, scanning electron microscopy and spectroscopic ellipsometry are used to study the light-induced changes from microscopic to macroscopic scales (up to tens of microns). Such comprehensive use of complementary techniques lead us to suggest that light-soaking produces the diffusion of molecular hydrogen, hydrogen accumulation at p-layer/substrate interface and localized delamination of the interface. Based on these results we propose that light-induced degradation of PIN solar cells has to be addressed from not only as a material issue, but also a device point of view. In particular we bring experimental evidence that localized delamination at the interface between the p-layer and SnO2 substrate by light-induced hydrogen motion causes the rapid drop of Jsc.

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“…While metastable defect creation is considered a local effect on the scale of atoms and bonds, it has also been argued that this can manifest large scale structural changes . Furthermore, it has been reported that metastable volumetric expansion Δ V/V as high as 10 −3 corresponds to large scale metastability . Therefore, it is natural to expect that these metastable structural effects should have metastable effects on the optical properties, which can be expressed in terms of n and k .…”

Section: Introductionmentioning

confidence: 99%

Light‐Induced Reversible Optical Properties of Hydrogenated Amorphous Silicon: A Promising Optically Programmable Photonic Material

Mohammed

Melskens

Kessels

et al. 2018

Physica Status Solidi (a)

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Reversible optical properties (refractive index, n, and extinction coefficient, k) upon light soaking and annealing are predicted to originate from the metastable properties of hydrogenated amorphous silicon (a-Si:H). Optically programmable photonic devices can be demonstrated when a-Si:H is established as a potential programmable photonic material. Therefore, the effects of prolonged high intensity light soaking and annealing are investigated. A set of a-Si:H films is deposited by inductively coupled plasma-enhanced chemical vapor deposition (ICP-PECVD) near the amorphous/nano-crystalline phase transition that have significantly different hydrogen content and microstructures. Spectroscopic ellipsometry shows that the imaginary part of the pseudo dielectric function values near the peak clearly decreases after light soaking and this decrease can be reversed after annealing. No loss of Si-bonded hydrogen is observed after repeated cycles of light soaking and annealing and an inverse correlation between this reversibility and the hydrogen content is found. A change in the bulk optical properties is likely the main contributor to the observed metastable effect, suggesting a reversible refractive index change. Repeated cycles of reversible behavior are demonstrated which together with the magnitude of reversibility (as high as 3.7% at 3.6 eV) illustrates the potential of a-Si:H for future programmable photonic devices.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.

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A study on the correlation between the photoinduced volume expansion and the internal stress in hydrogenated amorphous silicon

Cited by 9 publications

References 7 publications

Microscopic Description of Light Induced Defects in Amorphous Silicon Solar Cells

Microscopic Description of Light Induced Defects in Amorphous Silicon Solar Cells

Light induced electrical and macroscopic changes in hydrogenated polymorphous silicon solar cells

Light‐Induced Reversible Optical Properties of Hydrogenated Amorphous Silicon: A Promising Optically Programmable Photonic Material

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