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Efficient ZnO-Free Organic Solar Cells based on 2,6-Pyridinedimethanol as the Cathode Buffer Layer
김동근,진호철,( Ratna Dewi Maduwu ),( Sabrina Aufar Salma ),안병현,김주현 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
For an efficient Zinc Oxide (ZnO)-free organic solar cells (OSCs), a 2,6-pyridinedimethanol (Py-diOH) was spin-coated as the cathode buffer layer in PTB7:PC<sub>71</sub>BM-based bulk heterojunction (BHJ) OSCs. The energy level of indium tin oxide (ITO) was modified by introducing the Py-diOH layer, which generated a favorable interface dipole between ITO and active layer. The power conversion efficiencies (PCEs) of the device based on Py-diOH reached up to 7.44%, which is comparable with that of the device with ZnO as the electron transfer layer. In addition, it is possible to achieve high PCEs without any thermal treatment.
진호철,김동근,( Ratna Dewi Maduwu ),김주현 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Two easily accessible fluorene-substituted conjugated oligo-electrolytes (COEs), FTF- and FBF-NBr, have been developed as the electron transfer layers (ETLs) in inverted type organic solar cells (iOSCs). The iOSCs with ETLs show to improve the power conversion efficiency (PCE) and time-dependent stability of the cell that utilizes a high work function cathode. FBF- and FTF-NBr significantly improve the device parameters compared to the reference solar cells without ETLs, as reduce the work function of indium thin oxide (ITO). In this work, COEs have low HOMO levels -5.54 eV and -5.77 eV for FTF-NBr and FBF-NBr in order, which are favorable to hole-blocking ability. In order to investigate the effect of ETL on the photovoltaic properties, the iOSCs with FBF- and FTF-NBr as the interlayer at the cathode side 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.
Self-Assembled Monolayer Treated ZnO by Benzoic Acid Derivatives in Organic Solar Cells
( Ratna Dewi Maduwu ),김동근,진호철,( Sabrina Aufar Salma ),김주현 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Self-assembled monolayer (SAM) molecule derivatives from benzoic acid, such as 4-methoxybenzoic acid (MBA), 4-tertbutylbenzoic acid (BBA), and 4-fluorobenzoic acid (FBA), have different dipole orientation and magnitude. In this study, these benzoic acid derivatives were used as an electron injection/transporting layer in inverted type organic solar cells (OSCs) with a structure of ITO/SAM treated ZnO/active layer (P3HT:PC<sub>61</sub>BM)/MoO<sub>3</sub>/Ag, and then the performances of each are compared. The results showed that the power conversion efficiency (PCE) and the open circuit voltage (Voc) values of the devices based on ZnO/MBA and ZnO/BBA treated ZnO showed better performances than other devices. This can be caused by the direction of dipole moment of benzoic acid derivatives. Accordingly, this work provides an alternative strategy to improve the interface property between inorganic and organic materials in organic electronic devices by SAM treatment on the ZnO surface
( Ratna Dewi Maduwu ),김동근,진호철,( Sabrina Aufar Salma ),김주현 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Polymer solar cells have several attractive features. The active materials used for fabrication devices in PSCs are soluble in most of common organic solvents, have potentials to be flexible and manufactured in a continuous printing process. In PSCs, conjugated polyelectrolytes (CPEs) are generally used for introducing interfacial dipole, and many studies focus on the modulation of interfacial dipoles by altering the side chain through the delicate design to improve their functions. The interfacial dipole between photoactive layer and electrode play an important role in modification of work function and hole blocking ability. Herein, two CPEs, PHPT and PcoPT, which have different side chains and their salts were polymerized to compare the effect of conformation, and then fabricated for polymer solar cells (PSCs).
Organic electrolyte hybridized ZnO as the electron transport layer for inverted polymer solar cells
김동근,김윤환,Ratna Dewi Maduwu,진호철,문두경,김주현 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.65 No.-
Small molecular organic electrolyte; N,N,N,N,N,N-hexakis(2-hydroxyethyl)butane-1,4-diaminium bromide (C4), doped ZnO is prepared by a typical sol–gel process and used as the for an electron transport layer in inverted polymer solar cells (PSCs). The electron mobility of the doped ZnO is comparable to that of pristine ZnO because the crystallinity of the ZnO layer is not significantly affected by the doping process. The Kelvin probe microscopy measurements employ that the work function of doped ZnO are −4.0 eV, which is higher than that of pristine ZnO (−4.5 eV). This is due to that the formation of interface dipole at the interface between the ZnO layer and the active layer by unreacted hydroxyl groups and quaternary ammonium bromide. As a result, inverted PSC based on C4 doped ZnO exhibit the power conversion efficiency (PCE) up to 8.87%, which is a significant improvement over the device based on pristine ZnO (PCE = 7.4%). Note that the main contribution to the enhancement of the PCE is from the improvement of the Jsc.