Investigation of the effect of conjugated oligoelectrolyte as a cathode buffer layer on the photovoltaic properties

Trang, Thu; Hong, Hee Seob; Ha, Ye Eun; Lim, Gyeong Eun; Won, Yong Sun; Kim, Joo Hyun

doi:10.1016/j.synthmet.2014.10.006

Cited by 18 publications

(5 citation statements)

References 39 publications

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“…The R sh values of the devices based on NDIN-O, NDIN-Br, and NDIN-I are 0.274, 0.469, and 0.446 MΩcm 2 , respectively. These R sh values agree with device FF values, where lower FF values were obtained when SMs were applied compared to the ZnO-only-based device, indicating a possibility of leakage current with the device with SMs as the interlayer. − Even though the device with SMs has lower R sh values than the ZnO-based device, the device with SMs exhibits better J sc , which mostly contributes to PCE enhancement.…”

Section: Resultssupporting

confidence: 73%

Cathode Interlayer Based on Naphthalene Diimide: A Modification Strategy for Zinc-Oxide-Free Inverted Organic Solar Cells

Nasrun

Nisa

Salma

et al. 2023

ACS Appl. Mater. Interfaces

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Perylene diimide with ammonium oxide as a terminal group (named PDIN-O) is a well-known cathode interlayer in conventional-type organic solar cells (OSCs). Since naphthalene diimide exhibits a lower LUMO level than perylene diimide, we chose it as a core to further control the LUMO level of the materials. Small molecules (SMs) produce a beneficial interfacial dipole by the end of ionic functionality at the side chain of naphthalene diimide. With the active layer based on a nonfullerene acceptor (PM6:Y6BO), the power conversion efficiency (PCE) is enhanced by utilizing SMs as cathode interlayers. We discovered that the inverted-type OSC with naphthalene diimide with oxide as a counteranion (NDIN-O) shows poor thermal stability, which can cause irreversible damage to the interlayer−cathode contact, leading to poor PCE (11.1%). To overcome the disadvantage, we introduce NDIN-Br and NDIN-I with a higher decomposition temperature. An excellent PCE of 14.6% was achieved with the device based on NDIN-Br as an interlayer, which is almost the same as the PCE of the ZnO-based device (15.0%). The device based on NDIN-I without the ZnO layer exhibits an improved PCE of 15.4%, which is slightly higher than the ZnO-based device. The result offers a replacement of the ZnO interlayer, which is necessary to carefully manage the sol−gel transition by annealing temperatures as high as 200 °C and leading to low-cost manufacture of OSCs.

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Section: Resultssupporting

confidence: 73%

Cathode Interlayer Based on Naphthalene Diimide: A Modification Strategy for Zinc-Oxide-Free Inverted Organic Solar Cells

Nasrun

Nisa

Salma

et al. 2023

ACS Appl. Mater. Interfaces

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“…6–8 COEs are applied in various fields ranging from life science for the modification of cell membrane properties or microbe functions, 6,8,21–25 to materials science for the doping of organic semi-conductors 26 by the reduction of charge injection/extraction barriers at metal/organic interfaces in organic electronic devices. 7,27–30…”

Section: Introductionmentioning

confidence: 99%

“…A vast majority of studied COEs are based on well-established π-conjugated cores such as fluorene, 27,29,31 phenylene vinylene, 21–23 phenothiazine, 29 perylene and naphthalene diimide 32–34 and diketopyrrolopyrrole. 35,36…”

Section: Introductionmentioning

confidence: 99%

Synthesis, solubility and optical properties of π-conjugated oligoelectrolytes derived from bis-thiophene-dialkoxyphenylene derivatives

et al. 2023

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“…Charge collection at the electrode interfaces is considered the most crucial factor responsible for creating efficient devices. Interlayers made of alcohol/water-soluble conjugated polymer electrolytes (CPEs), − nonconjugated polymers, − alcohol/water-soluble conjugated − or nonconjugated small molecules, − and polar solvent treatments − have been used to attempt to improve the PCEs of the devices. When a thin film of these materials is present as an interlayer in the cathode interface, it dramatically improves the performance of the PSC.…”

Section: Introductionmentioning

confidence: 99%

“…When a thin film of these materials is present as an interlayer in the cathode interface, it dramatically improves the performance of the PSC. It has been reported that ionic end groups in side chains on the conjugated polymer backbone induce favorable interface dipoles, which in turn cause a reduction of the cathode work function. , Nonconjugated polymers or small molecules − can reduce the work function of the cathode owing to the formation of a favorable interface dipole. When compared to polymeric materials, small molecules have several advantages, such as a high degree of purity and ease of synthesis.…”

Section: Introductionmentioning

confidence: 99%

A Simple Approach to Fabricate an Efficient Inverted Polymer Solar Cell with a Novel Small Molecular Electrolyte as the Cathode Buffer Layer

Kim

Sylvianti

Marsya

et al. 2016

ACS Appl. Mater. Interfaces

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A novel small-molecule electrolyte, 1,1'-bis(4-hydroxypropyl)-[4,4'-bipyridine]-1,1'-diium bromide (V-OH), containing a mixture of PTB7:PCBM has been designed and synthesized as a cathode buffer layer for inverted polymer solar cells (iPSCs). The molecular structure of this new compound comprises a viologen skeleton with hydroxyl group terminals. While the viologen unit is responsible for generating a favorable interface dipole, the two terminal hydroxyl groups of V-OH may generate a synergy effect in the magnitude of the interface dipole. Consequently, the devices containing the V-OH interlayer exhibited a power conversion efficiency (PCE) of 9.13% (short circuit current = 17.13 mA/cm, open circuit voltage = 0.75 V, fill factor = 71.1%). The PCE of the devices with V-OH exhibited better long-term stability compared to that of the devices without V-OH. Thus, we found that it is possible to enhance the efficiency of PSCs by a simple approach without the need for complicated methods of device fabrication.

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Investigation of the effect of conjugated oligoelectrolyte as a cathode buffer layer on the photovoltaic properties

Cited by 18 publications

References 39 publications

Cathode Interlayer Based on Naphthalene Diimide: A Modification Strategy for Zinc-Oxide-Free Inverted Organic Solar Cells

Cathode Interlayer Based on Naphthalene Diimide: A Modification Strategy for Zinc-Oxide-Free Inverted Organic Solar Cells

Synthesis, solubility and optical properties of π-conjugated oligoelectrolytes derived from bis-thiophene-dialkoxyphenylene derivatives

A Simple Approach to Fabricate an Efficient Inverted Polymer Solar Cell with a Novel Small Molecular Electrolyte as the Cathode Buffer Layer

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