| 학회 |
한국공업화학회 |
| 학술대회 |
2015년 봄 (04/29 ~ 05/01, BEXCO (부산)) |
| 권호 |
19권 1호 |
| 발표분야 |
고분자_포스터 |
| 제목 |
Energy level tailoring for high power conversion efficiency of perovskite solar cells using self-organized polymeric hole extraction layers with high work function |
| 초록 |
The work function (WF) in hole extraction layers (HELs) can be tuned by using molecular surface engineering to control the surface composition in HEL films, which depends on the surface-enriched molecules and their concentration relative to the conducting polymer. Thus we used a self-organized HEL (SOHEL) which is composed of a conducting polymer composition (e.g., PEDOT:PSS) and a perfluorinated ionomer (PFI), i.e., tetrafluoroethylene-perfluoro-3,6-dioxa-4-methyl-7-octene-sulfonic acid copolymer. Here, we present solution-processed methylammonium lead iodide CH3NH3PbI3-based perovskite solar cells with a high-WF SOHEL for good energy level alignment with the IP level of CH3NH3PbI3. The SOHEL at the hole extraction interface can increase the built-in potential, the photocurrent, and thus the PCE of perovskite solar cells. We obtained high PCE of 11.7% in SP-PHJ perovskite solar cells under 100-mW/cm2 illumination. We find also that Voc of the SOHEL/perovskite device is increased depends on the fluorinated molecule rates, while the Fermi-level of SOHEL becomes pinned to the midgap state of the perovskite. It is because the hole extraction offset at the SOHEL/ perovskite is decreased as function of interface energy level of SOHEL. We also demonstrated flexible perovskite solar cells on a poly(ethylene terephthalate) (PET) substrate; they had PCE as high as 8.0%. |
| 저자 |
임경근1, 김학범2, 정재기2, 김진영2, 이태우1
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| 소속 |
1POSTECH, 2UNIST |
| 키워드 |
Perovsktie solar cell; self-organized; hole extraction layer; high work function; flexible
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| E-Mail |
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