[논문]Molecular engineering of a conjugated polymer as a hole transporting layer for versatile p–i–n perovskite solar cells

Chae, Sangmin; Yi, Ahra; Kim, Hyo Jung

doi:10.1016/j.mtener.2019.100341

[해외논문] Molecular engineering of a conjugated polymer as a hole transporting layer for versatile p–i–n perovskite solar cells

Materials today energy, v.14, 2019년, pp.100341 -

Chae, Sangmin (Corresponding author.) , Yi, Ahra , Kim, Hyo Jung

Abstract ▼ AI-Helper

Abstract Along with the development of perovskite materials, which have enormous potential for optoelectronics such as solar cells and light-emitting diode devices, numerous organic semiconductor polymers, which have been critically adopted into the hole and electron transporting layers, have been synthesized and studied. In n–i–p-structured perovskite solar cells, various outstanding polymer materials have been successfully applied. However, in p–i–n-structured solar cells, the hydrophobic nature of the polymers makes the sequential deposition of a perovskite thin film difficult. Several destructive methods have been proposed; however, a more efficacious and fundamental method is urgently needed. Here, we present a nondestructive polymer hole-transporting layer (HTL) thin-film formation process based on molecular engineering via a simple solvent process. When we used various solvents with different volatilities, perovskite film formation was achieved on polymer thin films formed from highly volatile solvents. In addition, we elucidated the structure and orientation of the molecules in the films and revealed that the molecular structure of face-on orientation for the horizontally aligned hydrophobic alkyl groups induced a lower surface energy of the film, as determined by grazing-incidence wide-angle X-ray scattering (GIWAXS) measurements. Furthermore, the tilt angle of the molecules, which was calculated from the results of quantitative near-edge X-ray absorption fine structure (NEXAFS) analysis, was found to correlate with the surface energy. This result provides guidance for polymer-orientation and surface-energy studies, and perovskite solar cells fabricated using the polymer HTL demonstrated good durability and flexibility. We expect that our approach represents a new route for fabricating p–i–n-structured solar cells and that numerous valuable p-type conjugated polymers will be developed via our proposed molecular engineering process. Highlights A nondestructive polymer hole-transporting layer (HTL) thin-film formation process has been developed for inverted planar perovskite solar cells based on molecular engineering via a simple solvent process. A combination of the X-ray techniques reveals that crystalline structure and orientation of the polymer molecules affect the surface energy of the resultant thin film. Perovskite solar cells fabricated using the molecular engineering process has demonstrated excellent flexibility and durability. Graphical abstract [DISPLAY OMISSION]

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[해외논문] Molecular engineering of a conjugated polymer as a hole transporting layer for versatile p–i–n perovskite solar cells

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[해외논문] Molecular engineering of a conjugated polymer as a hole transporting layer for versatile p–i–n perovskite solar cells

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