Interface engineering for efficient fullerene-free organic solar cells

Shivanna, Ravichandran; Rajaram, Sridhar; Narayan, K. S.

doi:10.1063/1.4916216

Cited by 26 publications

(16 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also, all depositions present agglomerations in the form of folds or flowers, probably due to the changing the drying pressure and some gelifing zones formed under the action of the centrifugal force during spin-coating deposition, which prevents the uniform/flat spreading of the coating [31][32][33]. There are cracks in the layers, which can be explained by the evaporation process of the solvent, but which do not constitute a disadvantage for the proposed use.…”

Section: Resultsmentioning

confidence: 99%

Influence of Dopant Nature on Biological Properties of ZnO Thin-Film Coatings on Ti Alloy Substrate

et al. 2020

View full text Add to dashboard Cite

In this paper, ZnO and Co2+/Mg2+-doped ZnO thin films on TiAlV alloy substrates were obtained. The films were deposited by spin coating of sol-gel precursor solutions and thermally treated at 600 °C for 2 h, in air and slow cooled. The doping ions concentration was 1.0 mol%. The study’s aim was to obtain implantable metallic materials with improved biocompatibility and antibacterial qualities. The characteristics of the thin films were assessed from the point of view of microstructure, morphology, wetting properties, antibacterial activity and biological response in the presence of amniotic fluid stem cells (AFSC). The results proved that all deposited samples were nanostructured, suggesting a very good antibacterial effect and proving to be suitable supports for cellular adhesion and proliferation. All properties also depended on the doping ion nature.

show abstract

Section: Resultsmentioning

confidence: 99%

Influence of Dopant Nature on Biological Properties of ZnO Thin-Film Coatings on Ti Alloy Substrate

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Work function plays a key role in organic electronics since effective charge carrier injection and collection are largely dependent on the work function of the electrodes . In literature, many different methods have been reported regarding how the work function of various electrodes including zinc oxide (ZnO), indium tin oxide (ITO), Au, or Al could be efficiently modified. Especially, ITO is widely used and considered to be a promising electrode for organic electronics such as organic solar cells (OSCs) for several reasons: it is transparent in the visible region and it has not only high conductivity but also the capability to collect either electrons or holes through work function modification .…”

Section: The Work Function Shift Of Polyelectrolytes Relative To Clementioning

confidence: 99%

Work Function Modification via Combined Charge‐Based Through‐Space Interaction and Surface Interaction

Yang

Bilby

Chung

et al. 2018

Adv Materials Inter

View full text Add to dashboard Cite

organic solar cells (OSCs) for several reasons: it is transparent in the visible region and it has not only high conductivity but also the capability to collect either electrons or holes through work function modification. [20] To illustrate, inverted OSCs, which have been extensively studied due to their superior long term ambient stability and printability relative to conventional OSCs, use ITO as a cathode by controlling its work function. [15,21,22] Thus, understanding the origin of the work function modification process is of critical importance for organic electronic devices. Currently, introducing a thin layer of interfacial materials between the electrode and the active layer is studied to modify the work function of the electrode through the formation of interfacial dipole interactions. For example, He et al. reported that the efficiency of OSCs can be raised to 9.2% by effective work function tuning with an alcohol/water-soluble conjugated polymer. [6] Lee et al. showed that high performance OSCs with 8.32% efficiency could be fabricated using a combination of poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) and nonconjugated polyelectrolytes as recombination layers that lead to effective work function reduction at the ITO electrode. [15] Additionally, both anionic and cationic polyelectrolyte interlayers have been studied to achieve a proper energy level alignment for Work function modification of electrodes is an important factor to achieve high performance in organic electronics. However, a clear explanation of the origin of work function modification has remained elusive. Here, it is investigated how the work function of electrodes is affected by the chargebased through-space interaction with the well-known surface interaction. The studies reveal that the formation of a surface dipole leads to a work function shift, even when the work function modifying layer and substrate are separated. A work function shift is also demonstrated by electrophoretic deposition of ionic polyelectrolytes while the same polyelectrolytes do not cause any work function shift when they are spin cast. More noteworthy is that a neutral (nonionic) polymer which has no specific surface-interacting functional groups can induce work function shift of its substrate by a chargebased through-space interaction when deposited by electrospraying. These results provide a more comprehensive understanding of work function modification and motivate the design and selection of a wide range of effective work function modifying layers for organic electronics.

show abstract

“…between 300 -500 nm thickness, the ZnO films reach their optimum features with isotropic wrinkle pattern with a characteristic fractal length. [14] Beyond 700 nm, the wrinkles are seen to grow in size.…”

Section: Nanopatterned Zno Films With Varying Thickness In P3ht Photomentioning

confidence: 99%

“…[9][10][11] ZnO is a non-toxic and environmentally friendly metal-oxide semiconductor, and is advantageous over other inorganic semiconductors since sol-gel chemistry allows the synthesis of high quality films with nano-patterning. [12][13][14] Nano-ridge patterning of ZnO in an inverted polymer solar cell was shown to improve the power conversion efficiency by almost 25% compared to planar ZnO nanoparticle based films. [12] Such a patterning strategy increases the interfacial area for electron collection.…”

Section: Introductionmentioning

confidence: 99%

“…However, texturing of the ZnO layer results in current inhomogeneity, which is often mitigated by surface modification or adding a buffer layer between the ZnO film and the active layer. [13][14][15][16] Other strategies for increasing the interfacial area and the response of photodetectors include the usage of ZnO nanorods. [17][18][19] The use of donor-acceptor conjugated polymers/oligomers has been on the rise in organic electronics due to the tunability of the bandgap energy and their structural property to support both electron and hole transport.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Hybrid ZnO-organic semiconductor interfaces in photodetectors: A comparison of two near-infrared donor-acceptor copolymers

Pickett

Mohapatra

Laudari

et al. 2017

Organic Electronics

View full text Add to dashboard Cite

Hybrid organic-inorganic photodiode interfaces have gained significant interest due to their unique physical properties such as mechanical flexibility and high photosensitivity. Two diketopyrrolopyrrole (DPP)-based donor-acceptor copolymers with different backbone conformations are characterized in an inverted non-fullerene photodiode architecture using ZnO nano-patterned films as the electron transport layer. The DPP copolymer with a thienothiophene unit (PBDT-TTDPP) is more planar and rigid compared to the DPP system with a thiophene unit connecting the donor and acceptor moieties within the monomer (PBDT-TDPP). The hybrid interfaces were optimized by using poly(3-hexylthiophene) (P3HT) as the p-type layer for monitoring the critical thickness and morphology of the ZnO layer. The maximum photoresponsivity from a P3HT:ZnO photodiode was found to be 56 mA/W. The photoresponsivity of PBDT-TTDPP:ZnO photodiodes were found to be more than two orders of magnitude higher than PBDT-TDPP:ZnO photodiodes, which is attributed to an enhanced transport of carriers due to the planar backbone conformation of the PBDT-TTDPP copolymer. Capacitance-voltage measurements from hybrid Schottky barrier interfaces further shed light into the nature of photocarriers and device parameters. Firstprinciples time-dependent density-functional theoretical calculations yield a higher absorptivity for the PBDT-TTDPP dimer compared to PBDT-TDPP.

show abstract

Interface engineering for efficient fullerene-free organic solar cells

Cited by 26 publications

References 31 publications

Influence of Dopant Nature on Biological Properties of ZnO Thin-Film Coatings on Ti Alloy Substrate

Influence of Dopant Nature on Biological Properties of ZnO Thin-Film Coatings on Ti Alloy Substrate

Work Function Modification via Combined Charge‐Based Through‐Space Interaction and Surface Interaction

Hybrid ZnO-organic semiconductor interfaces in photodetectors: A comparison of two near-infrared donor-acceptor copolymers

Contact Info

Product

Resources

About