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Nadhila Sylvianti,김윤환,김동근,Ratna Dewi Maduwu,진호철,문두경,김주현 한국고분자학회 2018 Macromolecular Research Vol.25 No.6
Electron acceptor-donor-acceptor type oligomers based on benzothiadiazole (BT) unit and a (4,8-bis((2-ethylhexyl)oxy)benzo[1,2-b:4,5-b']dithiophene-2,6- diyl) bis(trimethylstannane) (BDT) unit have been designed and prepared as electron- donating materials, which are 2,6-[5-(7-methyl-benzo[1,2,5]thiadiazol-4-yl)- thiophen-2-yl]-4,8-bis((2-ethylhexyl)oxy)benzo[1,2-b:4,5-b']dithiophene) (BDT-TBT) and 2,6-[5'-(3'-hexyl-[2,2']bithiophenyl-5-yl)-7-methyl-benzo[1,2,5]thiadiazole]-4,8- bis((2-ethylhexyl)oxy)benzo[1,2-b:4,5-b']dithiophene) (BDT-THTBT), for Organic Solar Cells (OSCs) with PC71BM as electron-accepting materials. The HOMO energy level is elevated by the number of thiophene ring as a p-bridge, which lowers the band gap. Inverted-type organic solar cells (OSCs) with a configuration of ITO/ZnO/BDT-TBT (or BDT-THTBT):PC71BM/MoO3/Al are fabricated. OSC based on BDT-THTBT exhibits the highest power conversion efficiency (PCE) of 1.04% with the best Jsc of 4.20 mA/cm2.
Self-assembled Poly(4-vinylpyridine) As an Interfacial Layer for Polymer Solar Cells
Nadhila Sylvianti,Thu Trang Do,Mutia Anissa Marsya,Juyun Park,강용철,김주현 대한화학회 2016 Bulletin of the Korean Chemical Society Vol.37 No.1
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 [Voc] = 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%).
Zwitterionic poly(4-vinylpyridine) derivative as the cathode buffer layer for polymer solar cells
( Nadhila Sylvianti ),김윤환,( Mutia Anissa Marsya ),안병현,김주현 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The charge injecting/collecting properties are related to the interfacial properties between the semiconducting layer and the cathode or the anode. Conjugated polymer electrolytes, alcohol-soluble neutral conjugated polymers have been mainly applied to the solution processable cathode interface layer of organic electronic devices. In this presentation, new type of interfacial layer material based on zwitterionic poly (4-vinylpyridine) derivative for the applications in organic solar cells will be introduced. Also, we will present the effect of the zwitterionic poly (4-vinylpyridine) derivative on the photovoltaic properties.
New series of acceptor-donor-acceptor type conjugated oligomers based on benzothiadiazole
( Nadhila Sylvianti ),김윤환,( Mutia Anissa Marsya ),안병현,김주현 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Conjugate polymers are now considered as a very important class of photoactive materials. Conjugated oligomer is one of the potential materials which is very interesting to be studied. However, the research on the conjugated oligomer still remains limited because both the chemical and electrochemical syntheses resulted in products poor solubility. A series of pentamers are synthesized with a structure of acceptor-donor-acceptor based on benzothiadiazole. In this research, we present the synthesis, optical, electrical properties, and their application of solar cells.
Photovoltaic properties of low band gap polymers based on 2,1,3-benzooxadiazole
( Nadhila Sylvianti ),김윤환,( Mutia Anissa Marsya ),이봉,김주현 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Polymer solar cells (PSCs), especially bulk heterojunction (BHJ) PSCs comprising p-conjugated polymers and fullerene derivatives have attracted much interest in recent years due to their solution processability and flexibility, which potentially allow them to be manufactured using low-cost, high-throughput processes such as roll-to-roll printing and inkjet printing. Herein, we will discuss the synthesis, characterization, and optical properties of the polymers as well as the photovoltaic properties of the devices based on these polymers. On the other hand, the influence of the number of thiophene rings and DIO as the processing additive will be discussed.
Synthesis and characterization conjugated oligomers based on benzothiadiazole derivatives
( Nadhila Sylvianti ),김윤환,( Mutia Anissa Marsya ),김주현 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Conjugated oligomer based on benzothiadiazole acceptor and cores (carbazole and silofluorene) as an electron donor are synthesized by the Suzuki coupling reaction for application in organic solar cells as the photoactive materials. We introduce thiophene rings to extend the π-conjugation length as a π-bridge. From the materials with extended conjugated length showed lowest band gap. Organic solar cells based BHJ type solar cells with donors and PC71BM showed pretty promising results. In this research, we present the synthesis, optical, electrical properties, and their application of solar cells.
( Nadhila Sylvianti ),김윤환,( Mutia Anissa Marsya ),이봉,김주현 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
In recent years, polymers and small molecules based on diketopyrrolopyrole(DPP) have been extensively studied in organic solar cells due to its planar structural features. By comparing with the polymers, small molecules have several advantages such as ease of synthesis and purificaion. In this study, we synthesized a series of new donor-acceptor-donor type small molecules based on DPP with different alkyl chains as electron deficient unit and perylene as electron rich unit. The effect of different alkyl chains on optical, electrochemical and photovoltaic properites will be dicussed. Besides, we also investigate change of optoelectrochemical properties by annealing process.
Synthesis and characterization conjugated oligomer based on phenothiazine derivative
Sylvianti, Nadhila,Marsya, Mutia Anissa,Kim, Youn Hwan,Park, Chan-Young,Chang, Dong Wook,Moon, Doo Kyung,Kim, Joo Hyun Informa UK (TaylorFrancis) 2017 Molecular Crystals and Liquid Crystals Vol.653 No.1
<P>An acceptor-donor-acceptor (A-D-A) type oligomer based on benzothiadiazole and phenothiazine, 3,7-bis-[5-(7-methyl-benzo[1,2,5]thiadiazol-4-yl)-thiophen-2-yl]-10-(2-octyl-dodecyl)-10H-phenothiazine (PTBT), is synthesized by the Suzuki Coupling reaction. In addition, we introduce thiophene (T) ring as a -bridge to extend the effective conjugation length. To investigate the effect of combination between strong electron donor and strong electron withdrawing on the diverse properties of conjugated oligomer on PTBT, optical and electrochemical properties are examined using UV-Vis absorption spectra and cyclic volatommograms (CV) that revealing HOMO/LUMO level at -5.36eV/-3.18eV with an optical band gap of 2.18eV, respectively. Inverted-type organic solar cells (OSCs) with a configuration of ITO/ZnO/PTBT:PC71BM/MoO3/Al are fabricated. Maximum power conversion efficiency of the organic solar cells (OSCs) based on PTBT is showed up to 0.44% with a short-circuit current density (J(sc)) of - 1.63mA/cm(2), V-oc of 0.87V, and fill factor (FF) of 30.9%.</P>