Replacement of n-type layers with a non-toxic APTES interfacial layer to improve the performance of amorphous Si thin-film solar cells

Hafeez, Hassan; Choi, Dae Keun; Lee, Chang Min; Jesuraj, P. Justin; Kim, Dong Hyun; Song, Aeran; Chung, Kwun Bum; Song, Myungkwan; Fei, Jun; Ryu, Sung‐Soo

doi:10.1039/c8ra07409g

Cited by 15 publications

(6 citation statements)

References 29 publications

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“…High-resolution XPS spectra were obtained to confirm the composition of the foam before and after 5BL coating (Figure S3). − Furthermore, FTIR was carried out to analyze the foam before and after the ATP/CS treatment (Figure b). The infrared (IR) absorption of b-PU exhibited peaks at ∼3310, 2840–3000, ∼1690, ∼1465, and ∼1057 cm –1 corresponding to the N–H, C–H, CO, CC, and C–O–C bonds, respectively. − However, strong IR absorptions of the ATP/CS coating on PU foam were only observed for the O–H, C–O–P, and P–O bonds at ∼3600, ∼1179, and ∼962 cm –1 , respectively. , These results indicate that ATP/CS was successfully coated onto PU foam through the LbL assembly.…”

Section: Resultsmentioning

confidence: 99%

Synergistic Adenosine Triphosphate/Chitosan Bio-coatings on Polyurethane Foam for Simultaneously Improved Flame Retardancy and Smoke Suppression

Song

Park

Jeong

et al. 2023

ACS Appl. Polym. Mater.

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Considering that fire safety is a persistent problem for most polymeric materials, including polyurethane (PU) foam, the demand for flame retardants (FRs) is growing. However, the use of conventional FRs containing halogenated and brominated chemicals has been continuously regulated owing to their toxicity. Here, we demonstrate the layer-by-layer (LbL) coating of negatively charged adenosine triphosphate (ATP) and positively charged chitosan (CS) as the synergistic FR on PU foam, a model flammable polymer material. The FR performance of the PU coated with LbL-assembled ATP and CS (ATP/CS-PU) was tested, and the results suggested that the ATP/CS layers were finely deposited on the surface of the PU without damaging the structure. Only five bilayers (5BL) were sufficient to impart excellent fire retardancy, which exhibited a limiting oxygen index value of 35% and the HF-1 rating in the UL94 foamed material horizontal burning test. In addition, ATP/CS(5BL)-PU showed a significant reduction in the peak heat release rate of 42.0% and in the total smoke release of 30.6% compared to that of bare PU (b-PU). Furthermore, the ATP/CS coatings did not deteriorate the mechanical properties of b-PU. Finally, combined thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR) showed that ATP/CS(5BL)-PU was safe because it suppresses hazardous gases, which is the main problem with conventional FRs.

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Section: Resultsmentioning

confidence: 99%

Synergistic Adenosine Triphosphate/Chitosan Bio-coatings on Polyurethane Foam for Simultaneously Improved Flame Retardancy and Smoke Suppression

Song

Park

Jeong

et al. 2023

ACS Appl. Polym. Mater.

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“…[ 1 ] The work function of APTS‐CQD was 4.28 eV, which was 0.2 eV lower than the control CQD film. APTS has a partially negative silanol group and a partially positive amine group, so the aligned APTS can form a dipole on the CQD film, which points from silanol to amine group, [ 35 ] lowering the work function of the APTS‐CQD layer (Figure S8, Supporting Information). To further clarify the orientation of APTS on CQD film, the contact angle (CA) of deionized water on each film was measured (Figure S9, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Quantum Dot‐Siloxane Anchoring on Colloidal Quantum Dot Film for Flexible Photovoltaic Cell

Kim,

Kozakci,

Lee

et al. 2023

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Lead sulfide (PbS) colloidal quantum dots (CQDs) are promising materials for next‐generation flexible solar cells because of near‐infrared absorption, facile bandgap tunability, and superior air stability. However, CQD devices still lack enough flexibility to be applied to wearable devices owing to the poor mechanical properties of CQD films. In this study, a facile approach is proposed to improve the mechanical stability of CQDs solar cells without compromising the high power conversion efficiency (PCE) of the devices. (3‐aminopropyl)triethoxysilane (APTS) is introduced on CQD films to strengthen the dot‐to‐dot bonding via QD‐siloxane anchoring, and as a result, crack pattern analysis reveals that the treated devices become robust to mechanical stress. The device maintains 88% of the initial PCE under 12 000 cycles at a bending radius of 8.3 mm. In addition, APTS forms a dipole layer on CQD films, which improves the open circuit voltage (VOC) of the device, achieving a PCE of 11.04%, one of the highest PCEs in flexible PbS CQD solar cells.

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“…Another strong evidence of the modification of fullerenol surface was provided by Si2p region of XPS spectrum ( Figure 1 c), where double peak is observed with signals centered at 103.6 and 104.2 eV assigned to 2p3/2 and 2p1/2 silicon atoms from the GLYMO linker [ 29 ]. Those signals show expected area ratio of 2:1 and splitting of 1.2 eV.…”

Section: Resultsmentioning

confidence: 99%

Novel C60 Fullerenol-Gentamicin Conjugate–Physicochemical Characterization and Evaluation of Antibacterial and Cytotoxic Properties

et al. 2022

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This study aimed to develop, characterize, and evaluate antibacterial and cytotoxic properties of novel fullerene derivative composed of C60 fullerenol and standard aminoglycoside antibiotic–gentamicin (C60 fullerenol-gentamicin conjugate). The successful introduction of gentamicin to fullerenol was confirmed by X-ray photoelectron spectroscopy which together with thermogravimetric and spectroscopic analysis revealing the formula of the composition as C60(OH)12(GLYMO)11(Gentamicin)0.8. The dynamic light scattering (DLS) revealed that conjugate possessed ability to form agglomerates in water (size around 115 nm), while Zeta potential measurements demonstrated that such agglomerates possessed neutral character. In vitro biological assays indicated that obtained C60 fullerenol-gentamicin conjugate possessed the same antibacterial activity as standard gentamicin against Staphylococcus aureus, Staphylococcus epidermidis, Pseudomonas aeruginosa, and Escherichia coli, which proves that combination of fullerenol with gentamicin does not cause the loss of antibacterial activity of antibiotic. Moreover, cytotoxicity assessment demonstrated that obtained fullerenol-gentamicin derivative did not decrease viability of normal human fibroblasts (model eukaryotic cells) compared to control fibroblasts. Thus, taking into account all of the results, it can be stated that this research presents effective method to fabricate C60 fullerenol-gentamicin conjugate and proves that such derivative possesses desired antibacterial properties without unfavorable cytotoxic effects towards eukaryotic cells in vitro. These promising preliminary results indicate that obtained C60 fullerenol-gentamicin conjugate could have biomedical potential. It may be presumed that obtained fullerenol may be used as an effective carrier for antibiotic, and developed fullerenol-gentamicin conjugate may be apply locally (i.e., at the wound site). Moreover, in future we will evaluate possibility of its applications in inter alia tissue engineering, namely as a component of wound dressings and implantable biomaterials.

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Replacement of n-type layers with a non-toxic APTES interfacial layer to improve the performance of amorphous Si thin-film solar cells

Abstract: Hydrogenated amorphous Si (a-Si:H) thin-film solar cells (TFSCs) generally contain p/n-type Si layers, which are fabricated using toxic gases.

Cited by 15 publications

References 29 publications

Synergistic Adenosine Triphosphate/Chitosan Bio-coatings on Polyurethane Foam for Simultaneously Improved Flame Retardancy and Smoke Suppression

Synergistic Adenosine Triphosphate/Chitosan Bio-coatings on Polyurethane Foam for Simultaneously Improved Flame Retardancy and Smoke Suppression

Quantum Dot‐Siloxane Anchoring on Colloidal Quantum Dot Film for Flexible Photovoltaic Cell

Novel C60 Fullerenol-Gentamicin Conjugate–Physicochemical Characterization and Evaluation of Antibacterial and Cytotoxic Properties

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