Integration of flower-like ZnO nanostructures with crystalline-Si interdigitated back contact photovoltaic cell as a self-powered humidity sensor

In this article, flower-like ZnO nanostructures were integrated with crystalline-Si interdigitated back contact photovoltaic cell by direct growth on its surface. These ZnO nanostructures not only possess the anti-reflective characteristics to increase the converting efficiency of photovoltaic cell but also serve as the humidity sensing material. For measurement of the self-powered humidity sensor, it can be seen that the measured current increased monotonically as we increased the related humidity (RH) from 40% to 95%. The plot of log-resistance as a function of RH also showed good linearity (Y = −0.0089X + 7.0914 and R2 = 0.9874).

[1]  D. Kohl,et al.  Work function and band bending on clean cleaved zinc oxide surfaces , 1979 .

[2]  Yue Zhang,et al.  Self-powered ultraviolet photodetector based on a single Sb-doped ZnO nanobelt , 2010 .

[3]  Zhong Lin Wang,et al.  ZnO nanotube-based dye-sensitized solar cell and its application in self-powered devices , 2010, Nanotechnology.

[4]  S. Morrison,et al.  Semiconductor gas sensors , 1985 .

[5]  L. Dai,et al.  Self‐Powered, Ultrafast, Visible‐Blind UV Detection and Optical Logical Operation based on ZnO/GaN Nanoscale p‐n Junctions , 2011, Advanced materials.

[6]  M. Aono,et al.  Pinecone-shaped ZnO nanostructures: Growth, optical and gas sensor properties. , 2011 .

[7]  Robert F. Davis,et al.  Gold Schottky contacts on oxygen plasma-treated, n-type ZnO(0001̄) , 2003 .

[8]  A. Fujishima,et al.  Photoinduced Surface Wettability Conversion of ZnO and TiO2 Thin Films , 2001 .

[9]  W. Tai,et al.  Humidity sensing behaviors of nanocrystalline Al-doped ZnO thin films prepared by sol–gel process , 2002 .

[10]  Zhong Lin Wang,et al.  Self-powered ultrasensitive nanowire photodetector driven by a hybridized microbial fuel cell. , 2012, Angewandte Chemie.

[11]  Lianxi Zheng,et al.  Self-powered, visible-light photodetector based on thermally reduced graphene oxide–ZnO (rGO–ZnO) hybrid nanostructure , 2012 .

[12]  Nitin Kumar,et al.  Fabrication of optically enhanced ZnO nanorods and microrods using novel biocatalysts. , 2005, Journal of Nanoscience and Nanotechnology.