화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.29, No.2, 149-156, February, 2021
DOI10.1007/s13233-021-9020-9  Export Citation
Introducing an Organic Hole Transporting Material as a Bilayer to Improve the Efficiency and Stability of Perovskite Solar Cells
Veera Murugan Arivunithi, Ho-Yeol Park, Saripally Sudhaker Reddy, Yeongju Do, Hyungjin Park, Eun-Sol Shin1, Yong-Young No1, Myungkwan Song2, †, and Sung-Ho Jin†
  • 1Department of Chemistry Education, Graduate Department of Chemical Materials, Institute for Plastic Information and Energy Materials, Pusan National University, Busan 46241, Korea
  • 1Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea
  • 2Advanced Functional Thin Films Department Surface Technology Division, Korea Institute of Materials Science (KIMS), 797 Changwondaero, Gyeongnam 51508, Korea
E-mail:,
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.
Keywords:bilayer;perovskite solar cell;hole transporting material;morphology;stability
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