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이준호,정미진,진호철,손동환,( Ratna Dewi Maduwu ),( Sabrina Aufar Salma ),김주현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
A new push-pull type of conjugated small-molecule-dyes, IDTT-CMCN and IDTT-HT-CMCN, based on indacenodithieno[3,2-b]thiophene (IDTT) and 2-(2-methyl-4H-chromen-4-ylidene)malononitrile (CMCN) were designed for application in organic solar cells. When it comes to forming the intramolecular charge transfer (ICT), push-pull structures are especially powerful, therefore enriching optical properties of the materials. IDTT-HT-CMCN has another π-space, enhanced solubility and smaller bandgap attributable to 3-hexylthiophene (HT) compare to IDTT-CMCN. In consequence, the power conversion efficiency (PCE) of IDTT-HT-CMCN (7.60%) is higher than IDTT-CMCN (1.03%) with a short circuit current (JSC) of 12.7 mA/cm2, open-circuit voltage (VOC) of 0.94 V, and fill factor (FF) of 63.8%.
Oligomer electrolytes as the Cathode Interlayer based on fluorene for polymer solar cells
이준호,진호철,정미진,손동환,( Ratna Dewi Maduwu ),( Sabrina Aufar Salma ),김주현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Oligomer interlayer materials named of BFB salt, TFT salt, and BfFBf salt were synthesized successfully by the Suzuki and Stille coupling reaction. All the materials revealed good solubility in the polar protic solvents such as methanol. The work function (WF) of ITO and ITO/ZnO decreased after being modified by BFB salt, TFT salt, and BfFBf salt. The materials had a better result in reducing the work function of ITO than ZnO, which indicate that salt materials can provide a stronger interfacial interaction than ZnO does. Subsequently, all cathode interfacial materials showed a good performance in modifying the WF of the metal cathode that indicates the formation of a favorable interface dipole which can facilitate charge injection. All the PCEs of the device with oligomer salts, BFB Salt (7.98%), TFT Salt (8.17%), and BfFBf Salt (8.26%), exhibit more superior than the device treated with methanol.
Novel conjugated small-molecule material based on 2-(2-methyl-4Hchromen-4-ylidene)malononitrile
이준호,진호철,정미진,( Ratna Dewi Maduwu ),( Sabrina Aufar Salma ),김주현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
IDTT-CMCN, IDTT-HT-CMCN were synthesized for novel organic solar cells based on indacenodithieno[3,2-b]thiophene (IDTT) and 2-(2- methyl-4H-chromen-4-ylidene)malononitrile (CMCN). IDTT-HT-CMCN has better solubility and smaller band gap than IDTT-CMCN because of the 3-hexylthiophene (HT) that is widely used as the π-bridge. IDTT-CMCN, IDTT-HT-CMCN show high performance and optical absorption due to effective intramolecular charge transfer (ICT) induced by push-pull effect from acceptor-donor-acceptor (A-D-A) structure. As a result, a power conversion efficiency (PCE) as high as 7.60% was achieved with a short circuit current of 12.7 mA/㎠, open circuit voltage of 0.94 V, and fill factor of 63.8%.
The Effect of Fluorine Substituent on the properties of Conjugated Oligo-Electrolytes
이준호,진호철,정미진,( Ratna Dewi Maduwu ),( Sabrina Aufar Salma ),김주현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Fluorene-based conjugated oligo-electrolytes (COEs) induced by two different Bridge, FTF- and FBF-NBr, were synthesized for the cathode interlayer (CIL) in inverted type polymer solar cells (iPSCs). The device embedded with CIL enhance the power conversion efficiency (PCE) and durability. FBF- and FTF-NBr obviously improve the device performance compared with the reference solar cells without CIL. In this paper, Due to low HOMO level, these interlayers have advantage to hole-blocking ability, and then iPSCs with FBF- and FTF-NBr as the interlayer were fabricated. As a result, the PCE of 7.89% with FBF-NBr and 8.05% with FTF-NBr as the ETL has been achieved.
Alcohol-soluble conjugated polymer as the interfacial layer of inverted polymer solar cell
이준호,진호철,정미진,( Ratna Dewi Maduwu ),( Sabrina Aufar Salma ),김주현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Electron transfer layer (ETL) play very important roles in organic solar cells (OSCs). In this paper, we synthesize two fluorene electron transfer materials P[IsoPh-OH-T] and P[IsoPh-Br-T] Salt with the same conjugated backbones but different substituents. To investigate the properties of these materials, the bulk heterojunction(BHJ) OSCs with device structure ITO / ZnO / ETL / PTB7:PC71BM / MoO3 / Ag were fabricated. As a result, Compare with reference device with ZnO/MeOH ( PCE = 7.41%), the devices with P[IsoPh-OH-T] and P[IsoPh-Br-T] Salt achieved PCE of 7.22%, 7.52% respectively. It has been reported that the interface interaction between interlayer and ITO or ZnO can affect work function. After evaluating the interface interaction, the work function of ITO with P[IsoPh-OH-T] and P[IsoPh-Br-T] Salt was shifted from the reference -4.8 eV to -4.46 and -4.44 eV.
A-D-A Small Molecule Donor based on Benzodithiophene and its Application in Organic Solar Cells
( Ratna Dewi Maduwu ),김주현,진호철,( Sabrina Aufar Salma ),이준호,정미진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
An acceptor-donor-acceptor (A-D-A) small molecule donor, named (BDT-HTOX), was synthesized for the application in organic solar cells (OSCs). Benzodithiophene (BDT) was used as central donor (D) unit and phenylisoxazol (OX) as acceptor (A) unit. Hexylthiophene (HT) ring as a π-bridge to extend the effective conjugation length and increase the solubility of the material. The HUMO/LUMO energy level of BDT-HTOX were -3.72eV/-5.44 eV with an optical band gap of 1.72 eV. The devices based on BDT-HTOX/PC71BM = 1:1 in chlorobenzene as a solvent for solution processed organic solar cells showed the best performance with maximum power conversion efficiency (PCE) up to 0.80%, short-circuit current density (Jsc) of -3.26 mA/cm2, Voc of 0.88 V, and fill factor (FF) of 27.9%.
( Ratna Dewi Maduwu ),김주현,진호철,( Sabrina Aufar Salma ),이준호,정미진 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
A1-D-A2-D-A1 type of structured BT-CMCN, which consists of an electron-deficient benzothiadiazole (BT) (A2), electron-rich thiophene (D) and electron-deficient dicyanomethylene-4H-chromene (CMCN) (A1) moiety, was synthesized. BT-CMCN showed good thermal stability with the onset of decomposition temperatures of 304℃ at 5 wt % loss. The HOMO/LUMO energy levels of the BT-CMCN were -5.29 eV/-3.58 eV and the optical band gap was 1.72 eV. The HOMO/LUMO energy levels of BT-CMCN are higher than those of PC<sub>71</sub>BM. Therefore, the device fabrication employed BT-CMCN as the donor unit and PC71BM as the acceptor unit. The best performance based on BT-CMCN/PC71BM in inverted-type of organic solar cells (OSCs) exhibits the PCE of 0.69% with a short-circuit current density (Jsc) of 2.03 mA/㎠, Voc of 0.79 V, and fill factor (FF) of 42.7%.