Temperature-induced exciton switching in long alkyl chain based inorganic-organic hybrids

被引：22

作者：

Pradeesh, K. ^{[1
]}

Baumberg, J. J. ^{[2
]}

Prakash, G. Vijaya ^{[1
]}

机构：

[1] Indian Inst Technol Delhi, Nanophoton Lab, Dept Phys, New Delhi 110016, India

[2] Univ Cambridge, Cavendish Lab, Nanophoton Ctr, Cambridge CB3 0HE, England

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 111卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

LAYERED-PEROVSKITE; PHASE-TRANSITIONS; QUANTUM-WELLS; (CNH2N+1NH3)(2)PBI4; SEMICONDUCTORS; N=12;

D O I：

10.1063/1.3674324

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Photoluminescence and transmission is systematically explored in thin films of long-alkyl-chain-based inorganic-organic (IO) hybrids (C(n)H(2n+1)NH(3))(2)PbI(4) (n = 12, 16, 18) (CnPI) and NH(3)C(12)H(22)NH(3)PbI(4) (DDPI). Such IO-hybrids, which form natural multiple quantum well structures stacked up along c-axis, possess strong room-temperature exciton transitions. These hybrids exhibit reversible phase transition of two different crystal phase transitions at easily accessible device temperatures. Flipping the structural phase is clearly reflected in switching of the excitons with corresponding photoluminescence and transmission changes showing clear thermal hysteresis. The phase-dependent switching of excitons is predominantly due to reversible crumpling of the inorganic PbI sheet networks. Systematic temperature dependent studies establish a correlation between the structure and optical exciton features. Such thermo-optic exciton switching suggests possible new photonic devices. (C) 2012 American Institute of Physics. [doi: 10.1063/1.3674324]

引用

页数：6