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아날리아 도라지오 컬만,Sabrina Aufar Salma,손동환,Rahmatia Fitri Binti Nasrun,이근대,홍성수,김주현 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Two new acceptor-donor-acceptor (A-D-A) type conjugated small molecule donors, denoted as IDTT-CMCN and IDTT-HT-CMCN, based on indacenodithieno[3,2-b]thiophene (IDTT) and 2-(2-methyl-4H-chromen-4-ylidene)malononitrile (CMCN), have been synthesized for application in organic solar cells. In these A-D-A type small-molecules IDTT is the electron donating unit while CMCN is the electron-withdrawing unit. In comparison with IDTT-CMCN, IDTT-HT-CMCN has 3-hexylthiophene (HT) as a π-bridge unit between the IDTT and CMCN moieties to increase the solubility and extend the π-conjugation length. OSCs based on both of these donors and PC71BM as the acceptor were fabricated to investigate the effect of alkylthiophenes on the photovoltaic properties. As a result, the IDTT-HT-CMCN showed a power conversion efficiency (PCE) as high as 7.60% with a short circuit current of 12.7 mA/cm², open circuit voltage of 0.94 V, and fill factor of 63.8%.
Synthesis and Characterization of Novel Donor-Acceptor Polymer for Polymer Solar Cell
아날리아 도라지오 컬만,김주현,Rahmatia Fitri Binti Nasrun,손동환,Sabrina Aufar Salma 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
The donor-acceptor (D-A) type polymers named BDT-HT-X and BDTF-HT-X have been synthetized and characterized as donor material for bulk heterojunction polymer solar cells (PSCs). These polymers were prepared via Stille polymerization between benzodithiophene (BDT) or fluorinated BDT (BDTF) and the electron deficient unit HT-X. The BDT-HT-X and BDTF-HT-X polymers possessed the highest occupied molecular orbital (HOMO) levels ranged -5.37 to -5.42 eV and the lowest unoccupied molecular orbital (LUMO) levels ranged -3.51 to -3.49 eV, which covered a broad absorption ranges with low optical bandgaps. To evaluate the photovoltaic performances of these polymers as a donor, inverted-type PSCs based on the blend of BDT-HT-X (or BDTF-HT-X), Y6BO as an acceptor were fabricated. The power conversion efficiencies (PCEs) of the optimized OSCs reached up to 3.73% for BDT-HT-X and 3.98% for BDTF-HT-X.
Sabrina Aufar Salma,아날리아 도라지오 컬만,손동환,Rahmatia Fitri Binti Nasrun,Seong-Soo Hong,김주현,Lee Gun Dae 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
The conjugated polymer electrolytes (CPEs) with backbone structure of dimethylamino propyl fluorene (FN), thiophene (T), benzothiadiazole (BT), and dithienyl benzothiadiazole (TBT) were synthesized. the post-polymerization treatment of the amino-terminal group was conducted for modification side chain functionality and improve the solubility. The incorporation of different functional group in the polymer backbone represent the different effects of polarity. We studied the effect of CPEs in polymer solar cell with different backbones and functionalities in the side chain. Different backbones produce different molecular dipoles, and the side chain functionality induces an interfacial dipole. Inverted polymer solar cells (iPSCs) based on ITO/ZnO/CPE/PTB7-Th:PC71BM/MoO₃/Ag were fabricated. Modifying the polymer backbone leads to improved efficiency and modifying the side chain functionality improves the performance compared with that of the interlayered neutral polymer.
Implementation of Small-molecule Electrolytes as Cathode Interlayer for Polymer Solar Cells
Sabrina Aufar Salma,김주현,아날리아 도라지오 컬만,Rahmatia Fitri Binti Nasrun,손동환 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
New small-molecule electrolytes named 4PBr and 2Ebr were designed and synthetized as the cathode interlayer for inverted PSCs. The structure of ((benzene-1,2,4,5-tetrayltetrakis(methylene))tetrakis(triphenylphosphonium) bromide) (4PBr) is constituted by a phenyl core with four benzyl triphenylphosphonium salts and (N,N0-(1,2-phenylenebis(methylene)) bis(N,N-diethylethanaminium) bromide) (2EBr) has two benzyl trialkyl ammonium salts. Both 2EBr and 4PBr have the advantage of allowing mass production with a simple synthetic procedure and high product yield. Inverted type PSCs based on ZnO with and without small-molecule electrolytes as the electron transporting layer were fabricated to investigate the effect of ionic functionalities on the photovoltaic properties. The power conversion efficiencies (PCEs) of the devices based on 2EBr and 4PBr reached up to 9.56% and 10.63% respectively, which are superior than the PCE of the device based on pristine ZnO.
Rahmatia Fitri Binti Nasrun,김주현,손동환,아날리아 도라지오 컬만,Sabrina Aufar Salma 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
A polymer based on fluorene, poly[(9,9-bis(30-(N,N-dimethylamino)propyl)-2,7- fluorene)-alt-2,7-(9,9-dihexylfluorene)] (PFN), was introduced to different amounts and types of acid derivatives such as acetic acid (AA), 4-trifluoromethyl benzoic acid (CF3BA), trifluoroacetic acid (CF3AA), and 4-toluene sulfonic acid (TsOH) as the cathode buffer layer in inverted organic solar cells (OSCs) with PTB7-Th:PC71BM blend as the active layer. The power conversion efficiency (PCE) of the OSC with pristine ZnO was 8.7%, while the PCE of the OSCs with the 1.0 equivalent of AA, CF3BA, CF3AA, and TsOH was 9.9, 10.3, 10.3, and 10.6%, respectively. The OSCs based on PFN with acid derivatives exhibit reduced trap-assisted recombination and interfacial bimolecular recombination which suited well with the trend of the PCEs of the devices and also matched the trend of the acid dissociation constant of acid derivatives.
Synthesis and Characterization of PFN with Different Backbone Structures for Polymer Solar Cells
손동환,김주현,Sabrina Aufar Salma,Rahmatia Fitri Binti Nasrun,아날리아 도라지오 컬만 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
We synthesized a PFN series based on (9,9-bis(3’-(N,N-dimethylamino)propyl)-2,7-fluorene) as an cathode buffer layer (CBL) in the inverted device for organic solar cells. The three kind of back bond compromise PFN conjugated polymer were named poly[(9,9-bis(3’-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-4,7-thiophene) (PFN-T), poly[(9,9-bis(3’-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-4,7-(2,1,3-benzothiadiazole)]) (PFN-BT), and poly-[(9,9-bis(3’-(N,N-dimethylamino)propyl)-2,7-fluorene)-alt-4,7-dithienyl-2,1,3 benzothiadiazole) (PFN-TBT). The contact between the donor and the n-type interlayer make an extra interface, which provide charge dissociation. Interface gives efficient electron extraction form the bulk heterojunction, which finally obtains much improved device performance. The highest device performance of PFN-BT accomplished 9.94% and Conjugated polymer onto the ZnO surface achieved high device performance of 9.9 (with a fill factor more than 60%).