使用碳纳米管/有机半导体/C60光探测器的宽光谱响应

Broad spectral response using carbon nanotube/organic semiconductor/C60 photodetectors.

作者信息

Arnold Michael S, Zimmerman Jeramy D, Renshaw Christopher K, Xu Xin, Lunt Richard R, Austin Christine M, Forrest Stephen R

机构信息

Departments of Physics, Electrical Engineering and Computer Science, and Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA.

出版信息

Nano Lett. 2009 Sep;9(9):3354-8. doi: 10.1021/nl901637u.

DOI:10.1021/nl901637u

PMID:19637853

Abstract

We demonstrate that photogenerated excitons in semiconducting carbon nanotubes (CNTs) can be efficiently dissociated by forming a planar heterojunction between CNTs wrapped in semiconducting polymers and the electron acceptor, C(60). Illumination of the CNTs at their near-infrared optical band gap results in the generation of a short-circuit photocurrent with peak external and internal quantum efficiencies of 2.3% and 44%, respectively. Using soft CNT-hybrid materials systems combining semiconducting small molecules and polymers, we have fabricated broad-band photodetectors with a specific detectivity >10(10) cm Hz(1/2) W(1-) from lambda = 400 to 1450 nm and a response time of tau = 7.2 +/- 0.2 ns.

摘要

我们证明，通过在包裹有半导体聚合物的碳纳米管（CNT）与电子受体C(60)之间形成平面异质结，半导体碳纳米管中的光生激子能够有效地解离。在碳纳米管的近红外光学带隙处对其进行光照，会产生短路光电流，其峰值外部和内部量子效率分别为2.3%和44%。利用结合了半导体小分子和聚合物的柔软碳纳米管混合材料系统，我们制造出了宽带光电探测器，其在波长范围λ = 400至1450 nm时的比探测率>10(10) cm Hz(1/2) W(-1)，响应时间τ = 7.2 ± 0.2 ns。