APL Nameplate
  • Volume/Page
  • Keyword
  • DOI
  • Citation
  • Advanced
   
 
 
 

Flickr Twitter iResearch App Facebook

BROWSE VOLUMES

Year Range: 
Search Issue | RSS Feeds RSS
Previous Issue Next Issue

19 Oct 2009

Volume 95, Issue 16, Articles (16xxxx)

Issue Cover Spotlight Figure

Appl. Phys. Lett. 95, 162501 (2009); http://dx.doi.org/10.1063/1.3248257 (3 pages)

W. W. Lei, D. Liu, P. W. Zhu, X. H. Chen, Q. Zhao, G. H. Wen, Q. L. Cui, and G. T. Zou
Enlarge Image | Read More
Return to All Sections
back to top
RSS Feeds
FREE

Vertical hybrid microcavity based on a polymer layer sandwiched between porous silicon photonic crystals

F. Yu. Sychev, I. E. Razdolski, T. V. Murzina, O. A. Aktsipetrov, T. Trifonov, and S. Cheylan

Appl. Phys. Lett. 95, 163301 (2009); http://dx.doi.org/10.1063/1.3245319 (3 pages) | Cited 4 times

Online Publication Date: 19 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
A vertical hybrid microcavity is fabricated by sandwiching a polymer layer between distributed Bragg reflectors (DBRs) composed of porous silicon photonic crystals. The DBRs are made by electrochemical etching of Si and consist of alternating porous Si layers of high and low porosity, the top DBR being a freestanding film. The hybrid microcavity demonstrates a deep microcavity mode placed within a 200 nm wide photonic band gap, and reveals a many-fold enhancement of the third-order nonlinearity of the microcavity layer. The fabrication technique employed is rather simple, enabling the use of a variety of functional materials as the microcavity spacer.
Show PACS
42.70.Qs Photonic bandgap materials
42.86.+b Optical workshop techniques
81.65.Cf Surface cleaning, etching, patterning
42.70.Jk Polymers and organics
FREE

Practical efficiency limits in organic photovoltaic cells: Functional dependence of fill factor and external quantum efficiency

Jonathan D. Servaites, Mark A. Ratner, and Tobin J. Marks

Appl. Phys. Lett. 95, 163302 (2009); http://dx.doi.org/10.1063/1.3243986 (3 pages) | Cited 22 times

Online Publication Date: 19 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
We evaluate practical power conversion efficiency limits (ηlim) in bulk-heterojunction organic photovoltaic (BHJ OPV) cells and how the field dependence of exciton dissociation affects cell efficiencies. We treat the fill factor limit as a function of the donor-acceptor lowest unoccupied molecular orbital offset energy (ELLO), calculating how this limit varies with decreasing ELLO. We also evaluate OPV external quantum efficiency as a function of wavelength from the optical transmittance and internal quantum efficiency limitations. For a given ELLO, we numerically optimize donor bandgap and ηlim and show that ηlim>10% should be possible for hypothetical OPV systems generating free charge carriers efficiently at ELLO ∼ 0.3–0.4 eV. Current BHJ OPVs with low ELLO values appear to be limited to cell efficiencies of ∼ 5% largely as a consequence of incomplete exciton dissociation.
Show PACS
84.60.Jt Photoelectric conversion
71.35.-y Excitons and related phenomena
71.55.-i Impurity and defect levels
72.20.Jv Charge carriers: generation, recombination, lifetime, and trapping
FREE

Performance improvement in transparent organic thin-film transistors with indium tin oxide/fullerene source/drain contact

Yu-Chang Li, Yu-Ju Lin, Chia-Yu Wei, Zheng-Xian Lin, Ten-Chin Wen, Mei-Ying Chang, Cheng-Liang Tsai, and Yeong-Her Wang

Appl. Phys. Lett. 95, 163303 (2009); http://dx.doi.org/10.1063/1.3240893 (3 pages) | Cited 4 times

Online Publication Date: 20 October 2009

Full Text: Read Online (HTML) | Download PDF

Show Abstract
With the use of fullerene (C60)/indium tin oxide (ITO) source/drain electrode, the performance of a transparent thin-film transistor could be enhanced dramatically. The drain current can be increased by a factor of more than 5. The improvements are attributed to the reduction of the injection barrier at the ITO/pentacene interface, which can be confirmed by the work function measured at the ITO/C60 and the contact resistance obtained by transmission line method. Meanwhile, the average transmittance in the visible region with a 3.5 nm C60 buffer layer for 65-nm-thick pentacene organic thin film transistors remains at 62.98%.
Show PACS
85.30.Tv Field effect devices
Return to All Sections
Close

Google Calendar

ADVERTISEMENT

Go to AIP Home   © AIP Publishing LLC
close