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Veera Murugan Arivunithi,박호열,Saripally Sudhaker Reddy,도영주,박형진,신은솔,노용영,송명관,진성호 한국고분자학회 2021 Macromolecular Research Vol.29 No.2
Although perovskite solar cells (PSCs) have achieved high power conversion efficiency (PCE) by utilizing 2,2',7,7'-tetrakis(N,N'-di-p-methoxyphenylamine)- 9,9'-Spirobifluorene (Spiro-OMeTAD) as hole transporting material (HTM), the reproducibility and stability of PSCs are still a pressing concern. Herein, we introduced a solvent processed organic-organic bilayer based on 2-(4-(7-(9,9-dimethylacridin-10(9H)- yl)-9,9-diethyl-9H-fluoren-2-yl)phenyl)-1-phenyl-1H-phenanthro[9,10-d]imidazole (AFpPPI) and Spiro-OMeTAD in layer to layer as HTM in PSCs. The devices configured with AFpPPI/Spiro-OMeTAD bilayer achieved a maximum PCE of 19.9% in mesoporous-TiO2 (mp-TiO2) structure with perovskite absorber of Cs0.05Rb0.05(FAPbI3)0.76 (MAPbBr3)0.14. The properties of the bilayer structure were analyzed with steadystate photoluminescence, ultra-violet photoelectron and impedance spectroscopy. The AFpPPI/Spiro-OMeTAD improved open-circuit voltage (VOC) by lowering the quasi-Fermi energy level for holes and reducing the charge recombination, resulting in high VOC (1.14 V in the champion cell) and high fill factor (FF) that lead to high PCE. The addition of AFpPPI layer improves the quality of Spiro-OMeTAD and provides pinhole-free film. Moreover, the stability is improved in controlled temperature and humid conditions. This work affords a new approach for commercial applications of PSCs with better stability.
Efficient dual cathode interfacial layer for high performance organic and perovskite solar cells
Aryal, Um Kanta,Arivunithi, Veera Murugan,Reddy, Saripally Sudhaker,Kim, Junyoung,Gal, Yeong-Soon,Jin, Sung-Ho Elsevier 2018 ORGANIC ELECTRONICS Vol.63 No.-
<P><B>Abstract</B></P> <P>Cathode interfacial layer (CIL), phenylquinoline-based, 10-ethyl-3,7-bis(4-phenylquinolin-2-yl)-10<I>H</I>-phenothiazine (PTDPQ) was employed between the ZnO and photoactive layer, poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-<I>b</I>]-thiophenediyl] (PTB7):[6,6]-phenyl C<SUB>71</SUB>-butyric acid methyl ester (PC<SUB>71</SUB>BM) for the inverted organic solar cells (IOSCs) and between LiF and PTB7:PC<SUB>71</SUB>BM for conventional organic solar cells (COSCs). It was also incorporated as interfacial layer in perovskite solar cells (PSCs). For the ZnO/PTDPQ bilayer, the power conversion efficiency (PCE) enhanced to 8.69%, which is about 15% improvement than that of the control IOSCs reference device. For the PTDPQ/LiF bilayer, it was achieved to 8.06%, and after insertion of PTDPQ as interfacial layer for PSCs, average PCE enhanced to 16.45% from that of 15.28% reference device. Hereinafter, PTDPQ as CIL enhances the solar cells device performance. It is analyzed that the charge recombination is suppressed and facilitates charge extraction due to the incorporation of the dual CIL as accordance with observed improvement of the solar cell parameters. The devices with dual CIL showed the higher electron mobility which matches with the higher fill factor and improved current density. The dual CIL exhibited excellent impact on enhancing the photovoltaic properties of OSCs and PSCs along with long-term stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The phenylquinoline based, PTDPQ is used as dual CIL for organic and perovskite solar cell application. </LI> <LI> Dual CIL played a great role in the improvement of overall photovoltaic performances. </LI> <LI> The solar cell devices with PTDPQ significantly enhanced both OSCs and PSCs performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>