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Multifunctional Bilayer Template for Near-Infrared-Sensitive Organic Solar Cells
Kim, Hyungchae,Park, Han Gyeol,Maeng, Min-Jae,Kang, Yu Ri,Park, Kyung Ryoul,Choi, Junho,Park, Yongsup,Kim, Young Dong,Kim, Changsoon American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.19
<P>For organic solar cells (OSCs) based on nonplanar phthalocyanines, it has previously been reported that a thin film composed of triclinic crystals with face-on (or flat-lying)-oriented molecules, typically obtained with a CuI template layer, is desired for optical absorption in the near-infrared (NIR) spectral region. However, this work demonstrates that for a PbPc−C<SUB>60</SUB> donor-acceptor pair, less face-on orientation with a broader orientation distribution obtained with a new template layer consisting of a ZnPc/CuI bilayer is more desirable in terms of solar cell efficiency than the face-on orientation. A NIR-sensitive PbPc−C<SUB>60</SUB> OSC employing this bilayer-templated PbPc film is found to increase the internal quantum efficiency (IQE) by 36% on average in the NIR spectral region compared to a device using a CuI-templated PbPc film. Analyses of the change in IQE using the exciton diffusion model and the entropy- and disorder-driven charge-separation model suggest that the improved IQE is attributed to the facilitated dissociation of charge-transfer excitons as well as the reduction in exciton quenching near the indium tin oxide surface.</P> [FIG OMISSION]</BR>
Jouhahn Lee,Yongsup Park 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.1
We have studied the interface electronic structures of Ca/tris-(8-hydorxyquinoline)aluminum (Alq3), Ca/NaF/Alq3, and Ca/MgF2/Alq3 by using X-ray and UV photoelectron spectroscopy (XPS and UPS). The UPS revealed that the Ca deposition on MgF2/Alq3 created weak gap states similar to Ca/Alq3 case, while the deposition of Ca on NaF/Alq3 showed relatively strong gap states. The N 1s core level peak measured with XPS exhibited a large satellite peak when Ca was deposited on NaF/Alq3, which was not seen in Ca/MgF2/Alq3. These changes indicate that both Na and Ca contribute to the charge transfer to the Alq3 molecules in Ca/NaF/Alq3, similar to Ca on LiF/Alq3. In contrast, only Ca or Mg plays a role in charge transfer in Ca/MgF2/Alq3, much like in Ca/Alq3. These observations suggest that charge transfer and chemical reactions at these interfaces could be important factors in energy-level alignments that determine the electron-injection barrier height.
Young Mi Lee,Yongsup Park,Yang Kim 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.2
Two crystal structures of fully dehydrated Ba²+- and Tl+-exchanged zeolite X, Ba30Tl32-X (a = 25.214(2) A) and Ba13Tl66-X (a = 25.167(2) A), have been determined by using single-crystal X-ray diffraction techniques in the cubic space group Fdbar3 at 21(1)℃. Their structures were refined to the final error indices R1 = 0.053 and ωR₂ = 0.116 with 637 reflections and R₁ = 0.060 and ωR₂= 0.126 with 628 reflections, for which Fo > 4σ(Fo). In the structure of Ba30Tl32-X, 30 Ba2+ ions were found at three crystallographic sites: 7 Ba2+ ions per unit cell occupy site I at the centers of the D6Rs, 3 Ba2+ ions occupy the 32-fold site I′. and the remaining 20 Ba2+ ions are at site II in the supercage. Thirty-two Tl+ ions were located at four crystallographic sites: 14 Tl+ ions occupy the 32-fold site I′ in the sodalite cavity opposite the D6Rs, 10 Tl+ ions occupy the 32-fold site II supercage and the remaining 8 Tl+ ions occupy two different III′ sites. In the structure of Ba13Tl66-X, 13 Ba2+ ions were found at three crystallographic sites: 1 at site I, 6 at site II and 6 at III′ Sixty-six Tl+ ions are found at four crystallographic sites: 31 at site I′ 26 at site II and the remaining 9 at two different III′ sites with occupancies of 3 and 6. Two crystal structures of fully dehydrated Ba²+- and Tl+-exchanged zeolite X, Ba30Tl32-X (a = 25.214(2) A) and Ba13Tl66-X (a = 25.167(2) A), have been determined by using single-crystal X-ray diffraction techniques in the cubic space group Fdbar3 at 21(1)℃. Their structures were refined to the final error indices R1 = 0.053 and ωR₂ = 0.116 with 637 reflections and R₁ = 0.060 and ωR₂= 0.126 with 628 reflections, for which Fo > 4σ(Fo). In the structure of Ba30Tl32-X, 30 Ba2+ ions were found at three crystallographic sites: 7 Ba2+ ions per unit cell occupy site I at the centers of the D6Rs, 3 Ba2+ ions occupy the 32-fold site I′. and the remaining 20 Ba2+ ions are at site II in the supercage. Thirty-two Tl+ ions were located at four crystallographic sites: 14 Tl+ ions occupy the 32-fold site I′ in the sodalite cavity opposite the D6Rs, 10 Tl+ ions occupy the 32-fold site II supercage and the remaining 8 Tl+ ions occupy two different III′ sites. In the structure of Ba13Tl66-X, 13 Ba2+ ions were found at three crystallographic sites: 1 at site I, 6 at site II and 6 at III′ Sixty-six Tl+ ions are found at four crystallographic sites: 31 at site I′ 26 at site II and the remaining 9 at two different III′ sites with occupancies of 3 and 6.
Jinha Shin,Hyunjae Park,Yongsup Choi 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
In this study, MoS<sub>2</sub> combined CNW electrodes for supercapacitor application were fabricated to improve the electrochemical capacitive properties using hydrogen introduced remote ECR plasma without heating system. The source of MoS<sub>2</sub> was prepared from ATTM. The results revealed that crystallization of ATTM to MoS<sub>2</sub> can be achieved by hydrogen radicals without heating system. Enhancement of specific capacitance was achieved by MoS<sub>2</sub> synthesis on CNW structure from 2.6 mFcm at pristine CNW electrode to 3.3, 5.8 and 8.5 mFcm<sup>-2</sup> depending on MoS<sub>2</sub> concentration.