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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.
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.
김동근,진호철,( Ratna Dewi Maduwu ),( Sabrina Aufar Salma ),안병현,김주현 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Organic solar cells (OSCs) have been developed due to their special properties as lightweight, low cost fabrication, and flexibility. Recently, the developments of polymer based electron donor materials and the device optimization in single junction OSCs have achieved the power conversion efficiencies (PCEs) over 11%. Despite the success of polymer donors, small molecule donors have attracted considerable attention owing to tunable energy levels, no batch-to-batch variation, and so on. In this work, we designed and synthesized acceptor-donoracceptor (A-D-A) type small molecule donors, including indacenodithieno[3,2-b]thiophene (IDTT) as electron donating moiety and new electron accepting units as end groups. Herein, we fabricated the OSCs with new donors and PC71BM as acceptor to investigate the photovoltaic properties.