Enhancing the efficiency of opto-electronic devices by the cathode modification

Ha, Ye Eun; Lim, Gyeong Eun; Jo, Mi Young; Park, Juyun; Kang, Yong‐Cheol; Moon, Sang‐Jin; Kim, Joo Hyun

doi:10.1039/c3tc32430c

Cited by 31 publications

(17 citation statements)

References 55 publications

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“…Here, we found that the V oc data of either iPSC or cPSC were not sensitive to the insertion of interlayer. Similar features were observed in the previous research . From the results, electrostatic self‐assembly of PVPy could be potential material as an IFL at the cathode interface in either iPSC or cPSC.…”

Section: Resultssupporting

confidence: 88%

“…For the cathode interface, π‐conjugated oligo‐ or polymer electrolytes have been mainly used for cathode buffer layer to achieve high performance devices. Zwitterionic conjugated polymer electrolytes and nonconjugated polar polymers such as poly(4‐vinylpyrirolidone), poly(4‐vinylalcohol), poly(sodium 4‐styrenesulfonate), polyviologen,, and tetra‐ n ‐alkyl ammonium bromides have been applied to PSCs as an interfacial layer (IFL) at the cathode side to improve the efficiency. By the insertion of the thin film of these materials between the cathode interfaces, the efficiency of the device is improved relative to that of the devices lacking these materials.…”

Section: Introductionmentioning

confidence: 99%

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Self‐assembled Poly(4‐vinylpyridine) As an Interfacial Layer for Polymer Solar Cells

Sylvianti

Trang

Marsya

et al. 2015

Bulletin Korean Chem Soc

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A nonconjugated polymer, poly(4‐vinylpyridine) (PVPy), is applied to polymer solar cells (PSCs) as an interfacial layer (IFL) either inverted or conventional type PSCs. The Kelvin probe microscopy measurements support the formation of favorable interface dipole at the cathode interface, indicating the reduction of an electron collection barrier from the active layer to the cathode. Inverted type PSC with PVPy as an IFL demonstrate the power conversion efficiency (PCE) of 3.20%, (open circuit voltage [V oc] = 0.61 V, short circuit current [J sc] = 8.68 mA/cm2, fill factor [FF] = 59.4%), which is better than the device without interlayer (PCE = 2.95%, V oc = 0.60 V, J sc = 8.11 mA/cm2, FF = 60.6%). Most increase in the PCE of the devices with interlayer is resulted from enhancement of the J sc. This is due to that the reduction of an electron collection barrier at the cathode interface. Conventional type PSC with PVPy (3.51%) at the cathode interface also exhibits better the PCE compared to that of the device without interlayer (2.88%).

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Section: Resultssupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Self‐assembled Poly(4‐vinylpyridine) As an Interfacial Layer for Polymer Solar Cells

Sylvianti

Trang

Marsya

et al. 2015

Bulletin Korean Chem Soc

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“…9 Those above-mentioned nonconjugated polymers including PEO, PEI, and PEIE are all used as cathode interlayers, because of the possible lone pair electrons or dipole effects. Additionally, some nonconjugated polymers with polar side groups were also used in OSCs as modifiers, such as poly(vinyl alcohol) (PVA) 144 and poly(2,2,6,6-tetramethylpiperidinyloxy methacrylate (PTMA). 145 PVA was used as the cathode interlayer to reduce the Schottky barrier in the device and improve the properties of film, while the PTMA interlayer was used to modify the anode of the device to improve the stability.…”

Section: Acs Applied Materials and Interfacesmentioning

confidence: 99%

Materials for Interfaces in Organic Solar Cells and Photodetectors

Chen

Wang

et al. 2019

ACS Appl. Mater. Interfaces

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Interface engineering is very important to the high performance of organic optoelectronic devices that are commonly composed of multilayer thin solid films. Interfacial materials are particularly crucial for interface engineering, and a variety of materials have been employed at the interface to accomplish various different functions. This Review summarizes various materials for the interfaces and some of the latest progress in organic solar cells (OSCs) and organic photodetectors (OPDs).

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“…Reducing the energy gap at the interface and passivation of ZnO surface are important to improve the performances of the devices. Many approaches have been tried to modify the surface of ZnO such as deposition of thin layer of conjugated or non‐conjugated polyelectrolytes (i.e., interlayer), metal chelates, and self‐assembled monolayer (SAM) treatments on the top of the ZnO surface to improve electron collection at the ZnO surface. In case of the former method, the performance of the device is very sensitive to the thickness of the interlayer, which is normally in the range of 5–10 nm and should be optimized.…”

Section: Introductionmentioning

confidence: 99%

Organic Electrolytes Doped ZnO Layer as the Electron Transport Layer for Bulk Heterojunction Polymer Solar Cells

Kim

Maduwu

et al. 2018

Solar RRL

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ZnO layers doped with small molecule viologen derivatives, i.e., 1,1 0 -bis(4hydroxypropyl)-[4,4 0 -bipyridine]-1,1 0 -diium bromide (V─OH) or 1,1 0 -bis(2,3dihydroxypropyl)-[4,4 0 -bipyridine]-1,1 0 -diium bromide (V─2OH), are prepared and used as the electron transport layer in inverted polymer solar cells (iPSCs). The presence of V─OH (or V─2OH) in ZnO layer and the formation of homogeneous V─OH (or V─2OH) doped ZnO layer are confirmed by Xray photoelectron spectroscopy. The electron mobilities of doped ZnO layers are comparable to those of pristine ZnO because the crystallinity of the ZnO layer is not significantly affected by the doping process. Kelvin probe microscopy measurements show that the work function of doped ZnO layers is in the range of À4.2 -À4.3 eV, which is higher than that of pristine ZnO (À4.5 eV). This is due to the formation of interface dipoles at the interface between the ZnO layer and the active layer. The water contact angle data reflect the existence of quaternary ammonium bromide on the surface, and unreacted hydroxyl groups are pointed away from the surface of the ZnO layer. iPSCs based on V─OH doped ZnO and V─2OH doped ZnO exhibit power conversion efficiencies (PCEs) up to 9.0% and 8.6%, which are dramatically enhanced compared to the device based on pristine ZnO (PCE ¼ 7.4%).

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Enhancing the efficiency of opto-electronic devices by the cathode modification

Abstract: A poly(vinyl alcohol) is applied to organic optoelectronic devices as a cathode buffer layer to improve the performances.

Cited by 31 publications

References 55 publications

Self‐assembled Poly(4‐vinylpyridine) As an Interfacial Layer for Polymer Solar Cells

Self‐assembled Poly(4‐vinylpyridine) As an Interfacial Layer for Polymer Solar Cells

Materials for Interfaces in Organic Solar Cells and Photodetectors

Organic Electrolytes Doped ZnO Layer as the Electron Transport Layer for Bulk Heterojunction Polymer Solar Cells

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