کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5399902 1505909 2014 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phosphor-doping enhanced efficiency in bilayer organic solar cells due to longer exciton diffusion length
ترجمه فارسی عنوان
افزایش کارایی فسفر دوپینگ در سلول های خورشیدی آلی دو لایه به دلیل طولانی شدن انتشار اکیتون طولانی
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
چکیده انگلیسی


- Optical model based on transfer matrix method was used to study phosphor-doped organic planar hetero-junction solar cells.
- The enhanced exciton diffusion length was experimentally investigated by absorption, PL, time-resolved transient PL, J-V and EQE curves.
- Only suitable phosphor dyes can increase exciton diffusion length.

We fabricated bilayer organic solar cells (OSCs) in the structure glass/ITO/PEDOT:PSS/PtOEP:MEH-PPV/C70/Al, where MEH-PPV was doped with platinum octaethylporphyrin (PtOEP). Enhanced exciton diffusion length (LD) is realized via converting generated singlet excitons to triplet excitons. Investigation based on transfer matrix simulations reveals that it is the extended exciton LD of the doping donor layer that leads to the short-circuit current density (Jsc) and power conversion efficiency (PCE) improvement, when compared with those of the OSCs with a non-doping donor layer. As a result of the increased LD, Jsc and PCE increase by 30% and 42% respectively for a device with 5 wt% PtOEP-doped 25 nm-thick donor layer. Meanwhile, by doping with phosphorescent bis(1-phenyl-isoquinoline)(acetylacetonato)iridium(III), the reduction in open-circuit voltage and the comparable Jsc are shown due to its higher HOMO level and higher LUMO level, leading to the decrease of PCE. It demonstrates that doping a polymer with a suitable phosphorescent molecule is an important approach to be considered to increase the exciton LD.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 151, July 2014, Pages 193-196
نویسندگان
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