上海科技大学知识管理系统

It is desirable to develop semiconductors with simultaneously multiple 
responses to single stimuli. Herein, a thermally responsive hybrid semicon-
ductor (AEV)[Pb2Br8] (AEV4+ = 1,1′-bis(2-ammonioethyl)-[4,4′- bipyridine]-1,1′-
diium) is successfully prepared by introducing functionalized organic cations 
into 1D lead(II) chains. The lead(II) chain contains an edge-sharing PbBr6 
octahedron with highly electron-deficient cations distributed in the inter-
space of the inorganic framework. Interestingly, the as-formed hybrid exhibits 
extraordinary thermochromic behavior along with intriguing temperature-
dependent conductivity and thermal conductivity due to the thermal motion 
of the electrons in the hybrid. Specifically, the color of the pristine hybrid 
changes from yellow to brown when the temperature rises to 70 °C, and 
gradually deepens as the temperature continues to rise, accompanied by the 
continuous decline in electric conductivity and thermal conductivity. Once 
heating is stopped, the color and conductivity recover to the original state in a 
few minutes. As demonstrated by electron paramagnetic resonance and X-ray 
photoelectron spectroscopy studies, the thermal-induced electron transfer is 
likely responsible for the intriguing thermally responsive behaviors. This work 
provides a paradigm for the modular and functional design of hybrid materials 
that manifest potential applications in semiconductor refrigeration, thermal 
power generation, intelligent circuit, and other opt-electronic devices.