Improvement in Wide-Gap A-SI:H For High-Efficiency Solar Cells

ABSTRACTA hydrogen-plasma treatment has been used for the first time to fabricate wide-gap, high-quality a-Si:H films. The hydrogen content (CH) of a-Si:H films substantially increases by the hydrogen-plasma treatment after deposition, without deteriorating the opto-electric properties of the films. The photoconductivity (σph) of ≥ 10-5 ο-1 cm-1, photosensitivity ( σ ph/σ d) of > 106 and SiH2/SiH of <0.2 are achieved for a film with CH of ∼25 atomic >%. The optical gap of the film is > 1.70 eV by the (α h ν )1/3 plot, and is >2 eV by the Tauc's plot. The open circuit voltage of a-Si solar cells exceeds 1 V conserving the fill factor of > 0.7 when the wide-gap a∼Si:H films are used as the i-layer, which proves the wide band gap and low defect density.

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High-Efficiency Lead-Free Wide Band Gap Perovskite Solar Cells via Guanidinium Bromide Incorporation

ACS Applied Energy Materials ◽

10.1021/acsaem.1c00413 ◽

2021 ◽

Author(s):

Mengmeng Chen ◽

Muhammad Akmal Kamarudin ◽

Ajay K. Baranwal ◽

Gaurav Kapil ◽

Teresa S. Ripolles ◽

...

Keyword(s):

Solar Cells ◽

Band Gap ◽

High Efficiency ◽

Perovskite Solar Cells ◽

Wide Band ◽

Lead Free ◽

Wide Band Gap

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Molecular Engineering Enhances the Charge Carriers Transport in Wide Band-Gap Polymer Donors Based Polymer Solar Cells

Molecules ◽

10.3390/molecules25184101 ◽

2020 ◽

Vol 25 (18) ◽

pp. 4101

Author(s):

Siyang Liu ◽

Shuwang Yi ◽

Peiling Qing ◽

Weijun Li ◽

Bin Gu ◽

...

Keyword(s):

Solar Cells ◽

Band Gap ◽

High Efficiency ◽

Polymer Solar Cells ◽

Acid Methyl Ester ◽

Wide Band ◽

Molecular Engineering ◽

Wide Band Gap ◽

Photovoltaic Properties ◽

Solvent Vapor

The novel and appropriate molecular design for polymer donors are playing an important role in realizing high-efficiency and high stable polymer solar cells (PSCs). In this work, four conjugated polymers (PIDT-O, PIDTT-O, PIDT-S and PIDTT-S) with indacenodithiophene (IDT) and indacenodithieno [3,2-b]thiophene (IDTT) as the donor units, and alkoxy-substituted benzoxadiazole and benzothiadiazole derivatives as the acceptor units have been designed and synthesized. Taking advantages of the molecular engineering on polymer backbones, these four polymers showed differently photophysical and photovoltaic properties. They exhibited wide optical bandgaps of 1.88, 1.87, 1.89 and 1.91 eV and quite impressive hole mobilities of 6.01 × 10−4, 7.72 × 10−4, 1.83 × 10−3, and 1.29 × 10−3 cm2 V−1 s−1 for PIDT-O, PIDTT-O, PIDT-S and PIDTT-S, respectively. Through the photovoltaic test via using PIDT-O, PIDTT-O, PIDT-S and PIDTT-S as donor materials and [6,6]-phenyl-C-71-butyric acid methyl ester (PC71BM) as acceptor materials, all the PSCs presented the high open circuit voltages (Vocs) over 0.85 V, whereas the PIDT-S and PIDTT-S based devices showed higher power conversion efficiencies (PCEs) of 5.09% and 4.43%, respectively. Interestingly, the solvent vapor annealing (SVA) treatment on active layers could improve the fill factors (FFs) extensively for these four polymers. For PIDT-S and PIDTT-S, the SVA process improved the FFs exceeding 71%, and ultimately the PCEs were increased to 6.05%, and 6.12%, respectively. Therefore, this kind of wide band-gap polymers are potentially candidates as efficient electron-donating materials for constructing high-performance PSCs.

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The Study of Optical and Electrical Properties of a-SiC:H for Multi-junction Si Thin Film Solar Cell

MRS Proceedings ◽

10.1557/proc-1245-a07-11 ◽

2010 ◽

Vol 1245 ◽

Author(s):

Jenny H. Shim ◽

W.K. Yoon ◽

S.T. Hwang ◽

S.W. Ahn ◽

H.M. Lee

Keyword(s):

Solar Cells ◽

Solar Cell ◽

High Efficiency ◽

Open Circuit Voltage ◽

Defect Density ◽

Wide Bandgap ◽

Open Circuit ◽

Deposition Condition ◽

Wide Bandgap Material ◽

Pressure Regime

AbstractStudies have shown that wide bandgap material is required for high efficiency multi-junction solar cell applications. Here, we address proper deposition condition for high quality a-SiC:H films. In high power high pressure regime, we observed that the defect density get much lowered to the similar defect level of a-Si:H film with high H2 dilution. Single junction solar cells fabricated with the optimized condition show high open circuit voltage and low LID effect. The degradation after the LID test was only 13 % reduction of the efficiency indicating that a-SiC:H could be promising material for multi-junction solar cells.

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Record 1.0 V open-circuit voltage in wide band gap chalcopyrite solar cells

Progress in Photovoltaics Research and Applications ◽

10.1002/pip.2914 ◽

2017 ◽

Vol 25 (9) ◽

pp. 755-763 ◽

Cited By ~ 32

Author(s):

Fredrik Larsson ◽

Nina Shariati Nilsson ◽

Jan Keller ◽

Christopher Frisk ◽

Volodymyr Kosyak ◽

...

Keyword(s):

Solar Cells ◽

Band Gap ◽

Open Circuit Voltage ◽

Wide Band ◽

Open Circuit ◽

Wide Band Gap

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Tailoring the Open-Circuit Voltage Deficit of Wide-Band-Gap Perovskite Solar Cells Using Alkyl Chain-Substituted Fullerene Derivatives

ACS Applied Materials & Interfaces ◽

10.1021/acsami.8b04439 ◽

2018 ◽

Vol 10 (26) ◽

pp. 22074-22082 ◽

Cited By ~ 23

Author(s):

Dhruba B. Khadka ◽

Yasuhiro Shirai ◽

Masatoshi Yanagida ◽

Takeshi Noda ◽

Kenjiro Miyano

Keyword(s):

Solar Cells ◽

Band Gap ◽

Open Circuit Voltage ◽

Alkyl Chain ◽

Perovskite Solar Cells ◽

Wide Band ◽

Open Circuit ◽

Wide Band Gap ◽

Fullerene Derivatives

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Mechanism of the Improvement in Microcrystalline Silicon Solar Cells by Hydrogen Plasma Treatment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.773.118 ◽

2013 ◽

Vol 773 ◽

pp. 118-123

Author(s):

Jing Yan Li ◽

Xiang Bo Zeng ◽

Hao Li ◽

Xiao Bing Xie ◽

Ping Yang ◽

...

Keyword(s):

Solar Cells ◽

Electric Field ◽

Plasma Treatment ◽

Defect Density ◽

Hydrogen Plasma ◽

Microcrystalline Silicon ◽

One Dimensional ◽

Long Wavelength ◽

Drift Length ◽

Experimental Improvement

We explain the experimental improvement in long wavelength response by hydrogen plasma treatment (HPT) in n/i interface. The absorption coefficient of the intrinsic microcrystalline silicon (μc-Si) is decreased in the low energy region (0.8~1.0 eV) by HPT, which indicates a lower defect density in μc-Si layer deposited with HPT than its counterpart without HPT. Simulation by one-dimensional device simulation program for the Analysis of Microelectronic and Photonic Structures (AMPS-1D) shows a higher long wavelength response in μc-Si solar cell if the defect density in intrinsic μc-Si layer is smaller. Our simulation results also disclose that the less defect density in intrinsic layer, the lower recombination rate and the higher electric field is. Higher electric field results in longer drift length which will promote collection of carriers generated by photons with long wavelength. Thus we deduce that HPT decreased defect density in absorber layer and improved the performance of μc-Si solar cells in long wavelength response.

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High-efficiency photovoltaic cells with wide optical band gap polymers based on fluorinated phenylene-alkoxybenzothiadiazole

Energy & Environmental Science ◽

10.1039/c6ee03051c ◽

2017 ◽

Vol 10 (6) ◽

pp. 1443-1455 ◽

Cited By ~ 52

Author(s):

Seo-Jin Ko ◽

Quoc Viet Hoang ◽

Chang Eun Song ◽

Mohammad Afsar Uddin ◽

Eunhee Lim ◽

...

Keyword(s):

Solar Cells ◽

Band Gap ◽

High Performance ◽

Optical Band Gap ◽

High Efficiency ◽

Bulk Heterojunction ◽

Polymer Solar Cells ◽

Photovoltaic Cells ◽

Wide Band ◽

Wide Band Gap

A new series of wide band gap photovoltaic polymers based on a fluorinated phenylene-alkoxybenzothiadiazole unit with an optical band gap of over 1.90 eV are designed and utilized for high-performance single- and multi-junction bulk heterojunction polymer solar cells.

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