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The effect of 2,6-pyridinedimethanol applied on behalf of ZnO to inverted organic solar cells
진호철,정미진,이준호,( Sabrina Aufar Salma ),( Ratna Dewi Maduwu ),김주현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Until now, many researchers have proved that decreasing a Schottky barrier can be a way to improving the power conversion efficiency (PCE) of organic solar cells. 2,6-pyridinedimethanol (2,6-PydiOH) is applied to inverted organic solar cells (iOSCs) based on the configuration with ITO / 2,6-PydiOH / PTB7:PC71BM / MoO3 / Ag to decreasing the Schottky barrier. A thin layer of the 2,6-PydiOH induces an interface dipole on the ITO layer. The PCE of the devices the 2,6-PydiOH is applied achieved 7.44% with a short circuit current density (J<sub>sc</sub>) of 14.65 mA/㎠, an open circuit voltage (V<sub>oc</sub>) of 0.71 V, and a fill factor (FF) of 67.9%, respectively. It is noteworthy that the PCE for devices with the 2,6-PydiOH has a value similar to those with ZnO. It is possible to fabricate the high efficiency iOSCs without any thermal annealing over 150°C.
Association of acidity in Polyfluorene based-Electrolytes with the Photovoltaic Properties
진호철,정미진,이준호,( Ratna Dewi Maduwu ),( Sabrina Aufar Salma ),손동환,김주현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The interfacial effect on photogenerated holes and electrons transfer is known related with a Schottky barrier and the resistance of device. Herein, we investigated the association of acidity in polyfluorene based-electrolytes (PFN) with the photovoltaic properties, such as the Schottky barrier and the resistance of device. The PFN has been famous, but the association between PFN and acid is rarely investigated. Thus, we selected four materials with different acidity, where the pKa value are from 4.7 to -2.8. The power conversion efficiencies (PCEs) were performed to investigate the effect of acidity. To explain the photovoltaic parameter, especially the short-circuit current density (Jsc) and the fill factor (FF), the Kelvin probe microscopy and the impedence spectroscopy were performed. The result shows well-matched association with the photovoltaic properties, where the high Jsc correspond to the low Schottky barrier and the high FF correspond to the high recombination resistance.
진호철,김주현,정미진,이준호,( Sabrina Aufar Salma ),( Ratna Dewi Maduwu ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
For high-efficiency organic solar cells, it is a required condition that photogenerated electrons move smoothly to the cathode. This can be achieved by introducing electrolytes into the cathode buffer layer (CBL). Using structural flexibility of organic electrolytes, we investigated the alkyl chain length’s effect about the solar cell efficiency based on fixed core structure, alkyl-quaternized bipyridine with tosylate. The organic electrolytes were named V-C4-OTs, V-C6-OTs, and V-C12-OTs, respectively. Power conversion efficiency (PCE) and incident photonto- electron conversion efficiency (IPCE) were investigated with the device structure of ITO/ZnO/CBL/Aactive/MoO<sub>3</sub>/Ag. Work function was also investigated using Kelvin probe microscopy (KPM) measurements. The improved PCE and IPCE were induced by enhancement of the photogenerated current density, which be matched with decrease of a Schottky barrier well.
New Small Molecular Electrolyte Doped ZnO as the Electron Transport Layer in Organic Solar Cells
정미진,김주현,진호철,이준호,( Sabrina Aufar Salma ),( Ratna Dewi Maduwu ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
New small molecular electrolyte was designed and doped into zinc oxide (ZnO) as an electron transport layer (ETL), which improve the power conversion efficiencies (PCEs) of organic solar cells (OSCs). The electrolyte has two hydroxyl groups at the end of the material, which forms a favorable interface dipole between ZnO layer and active layer. As a result, work function of the device based on new material was changed from -4.40 (pristine ZnO) to -4.23 eV (doped ZnO). OSC with the structure of ITO/doped ZnO/PTB7 :PC71BM/MoO3/Ag was fabricated to observe the effect of new material as ETL. The PCE of the device based on doped ZnO was acheived up to 8.27%, which is higher than the PCE of the device based on pristine ZnO (7.48%).
정미진,김주현,진호철,이준호,( Sabrina Aufar Salma ),( Ratna Dewi Maduwu ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Novel organic electrolytes were synthesized and applied to a cathode buffer layer in inverted polymer solar cells (iPSCs). The prepared electrolytes consist of polar quaternary ammonium bromide and hydroxyl groups, which are C4-OH and C4-3OH. A favorable interface dipole is generated due to the quaternary ammonium bromid. Furthemore, the interface dipole magnitude is increased through the polar hydroxyl groups. Thus, the number of hydroxyl groups have an influence on the power conversion efficiencies (PCEs) of iPSCs. The PCE of device based on C4-3OH was higher than the PCE of device based on C4-OH. The best PCE of device with C4-3OH was reached up to 9.20%.
The Change of Interfacial Property through Modifying a Cathode Buffer Layer in Polymer Solar Cells
정미진,김주현,진호철,이준호,( Sabrina Aufar Salma ),( Ratna Dewi Maduwu ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
A simple modification of cathode buffer layer was developed to change the interfacial property in polymer solar cells (PSCs). In this presentation, 2-hydroxypyridine (2OH-Py) and 4-hydroxypyridine (4OH-Py) were introduced between a cathode and an active layer as a cathode buffer layer in PSCs, which showed the difference of interfacial dipole by utilizing different position of hydroxyl group in pyridine. It was found that the work function of 2OH-py and 4OH-py is -3.92 and -4.23 eV, respectively. This data is caused by the different interfacial dipole at the cathode interface. As a result, the power conversion efficiency (PCE) of the device based on 2OH-py is higher than the PCE of the device with 4OH-py.
진호철,정미진,이준호,( Sabrina Aufar Salma ),( Ratna Dewi Maduwu ),손동환,김주현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The efficiency of devices is essential prerequisite for the energy industry. For high efficiency, it is important to decrease the interfacial resistance of the device composed of multi-layers. This can be easily achieved by inserting new electrolyte between the photoactive layer and electrode. We designed new electrolyte, named 2,2’-(ethane-1,2- diylbis(oxy))bis(N,N,N-trimethylethananminium) benzenesulfonate (TEG-2OTs), inserted as a thin layer. The result obviously showed the correlation between device efficiency and the decreasing of a Schottky barrier, where the Schottky barrier was induced from the difference between acceptor material’s LUMO and electrode (the difference without electrolyte 0.34, with eletrolyte 0.01). The decreasing of the Schottky barrier originated from the induced-dipole at the cathode interface from the electrolyte which lead to the well matched efficiency of the devices (PCEs of 7.48% and 7.78%, respectively).