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New Small Molecular Electrolyte Doped ZnO as the Electron Transport Layer in Organic Solar Cells
정미진,김주현,진호철,이준호,( Sabrina Aufar Salma ),( Ratna Dewi Maduwu ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
New small molecular electrolyte was designed and doped into zinc oxide (ZnO) as an electron transport layer (ETL), which improve the power conversion efficiencies (PCEs) of organic solar cells (OSCs). The electrolyte has two hydroxyl groups at the end of the material, which forms a favorable interface dipole between ZnO layer and active layer. As a result, work function of the device based on new material was changed from -4.40 (pristine ZnO) to -4.23 eV (doped ZnO). OSC with the structure of ITO/doped ZnO/PTB7 :PC71BM/MoO3/Ag was fabricated to observe the effect of new material as ETL. The PCE of the device based on doped ZnO was acheived up to 8.27%, which is higher than the PCE of the device based on pristine ZnO (7.48%).
정미진,진호철,( Sabrina Aufar Salma ),이준호,( Ratna Dewi Maduwu ),손동환,홍성수,김주현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Inverted polymer solar cells (iPSCs) have been developed for the effective photovoltaic technology with the lightweight, low-cost process, and flexibility. To achieve the outstanding performance of iPSCs, zinc oxide (ZnO) and small molecules are mainly hybridized for solving the thickness tolerance problem. In this presentation, new small molecular eletrolyte (C6-E-OTs) was synthesized and hybridized into ZnO as an electron transport layer (ETL). The device based on hybridized ZnO with 10.0 wt. % of C6-E-OTs is optimum condition, which reached up to the high power conversion efficiency (PCE), 8.8 %. We fabricated three kind of devices, which are the devices with hybridized ZnO, ZnO/Interlayer, and hybridized ZnO/Interlayer. Moreover, the device with the structure of hybridized ZnO/Interlayer showed the highest PCE, 8.9 %. These results were proved through investigating enhanced short circuit current density (Jsc) and lower work function than pristine ZnO.
정미진,( Sabrina Aufar Salma ),( Rahmatia Fitri Binti Nasrun ),이준호,손동환,( Analia Dorazio Colman ),김주현 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
New small-molecule electrolyte (C6-E-OTs) was designed as an electron transport layer in organic solar cells, which enhanced the power conversion efficiencies (PCEs). The electrolyte contains quaternary ammonium as a cation and tosylate ion as an anion with two hydroxyl groups to from a favorable interface-dipole at the cathode interface. In terms of device fabrication, various methods were introduced to control thickness of thin layer based on the C6-E-OTs, which are bilayer, hybridized layer and hybridized bilayer. The maximum PCE of the devices based on the hybridized layer exhibited better performance than the device based on the bilayer. Moreover, the device based on the hybridized bilayer showed the highest PCE of 8.9% when the PCE of the device based on pristine ZnO reached up to 7.6%. Main contribution to superior photovoltaic property of the device based on the hybridized bilayer is improved Jsc, which was increased up to 17.9mA/㎠.
Viologen Derivatives with Different Hydrophilicity as the Cathode Interlayer in Polymer Solar Cells
정미진,이준호,( Sabrina Aufar Salma ),임권택,김주현 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Novel non-conjugated electrolyes were synthesized to apply as a cathode interlayer, which improved power conversion efficiencies (PCEs) of polymer solar cells (PSCs). The electrolytes; V-C4-OTs, V-C6-OTs, and V-C12-OTs contain a viologen skeleton with tosylate anion and alkyl chains of different length. This viologen unit has high electron affinity, low lying reduction potential and generates a favorable interfacial dipole between ZnO layer and an active layer. Furthermore, tosylate anion will increase magnitude of dipole moment. Thus, work function of pristine ZnO and ZnO with V-C4-OTs, V-C6-OTs, and V-C12-OTs indicated -4.4, -4.33, -4.26 and -4.19 eV, respectively. PSCs were fabricated with PTB7 and PC<sub>71</sub>BM as the active layer. The highest PCE of the device based on V-C12-OTs were achieved up to 8.6%, which is better than the device based on pristine ZnO (7.6 %). In addition, the PCE of the devices based on V-C4-OTs and V-C6-OTs was reached to 8.1 % and 8.3 %, respectively.
The Change of Interfacial Property through Modifying a Cathode Buffer Layer in Polymer Solar Cells
정미진,김주현,진호철,이준호,( Sabrina Aufar Salma ),( Ratna Dewi Maduwu ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
A simple modification of cathode buffer layer was developed to change the interfacial property in polymer solar cells (PSCs). In this presentation, 2-hydroxypyridine (2OH-Py) and 4-hydroxypyridine (4OH-Py) were introduced between a cathode and an active layer as a cathode buffer layer in PSCs, which showed the difference of interfacial dipole by utilizing different position of hydroxyl group in pyridine. It was found that the work function of 2OH-py and 4OH-py is -3.92 and -4.23 eV, respectively. This data is caused by the different interfacial dipole at the cathode interface. As a result, the power conversion efficiency (PCE) of the device based on 2OH-py is higher than the PCE of the device with 4OH-py.