Perovskite based photosensor for electrochemical studies

Photosensors are used for the detection of analytes in microfluidic devices. In order to detect materials with low concentrations, a sensor with high sensitivity is required. Perovskite has been studied extensively as a photoactive material in solar cells due to its wide absorption spectrum and low recombination rate of charges which also make it a suitable candidate for photosensors. In this work, the photoconductivity of the material in a thin-film resistor is studied. The resistance of the device is measured at different wavelengths and intensities. A significant change of the resistance is observed upon illumination indicating the adequacy of the device to serve as a photosensor. However, in this case, the perovskite layer must be protected with an insulating thin film to avoid undesired reactions and contacts. The perovskite film was also tested as an electrochemical photosensor. The current-voltage characteristics of the device showed a diode rectifying response both in dark and under illumination. In this case, the photo response of the device established promising results for applications in photosensors with a relatively high stability in a liquid media.

[1]  T. Zhai,et al.  Crystal organometal halide perovskites with promising optoelectronic applications , 2016 .

[2]  Peter Lund,et al.  Review of materials and manufacturing options for large area flexible dye solar cells , 2011 .

[3]  R. Mertens,et al.  Injection- and space charge limited-currents in doped conducting organic materials , 2001 .

[4]  Weifeng Zhang,et al.  Dye-Sensitized Solar Cells Based on , 2011 .

[5]  Nam-Gyu Park,et al.  11% Efficient Perovskite Solar Cell Based on ZnO Nanorods: An Effective Charge Collection System , 2014 .

[6]  A. Takshi,et al.  Electrochemical Detection of Piezoelectric Effect from Misaligned Zinc Oxide Nanowires Grown on a Flexible Electrode , 2014 .

[7]  H. Seggern,et al.  Space-charge limited current in regioregular poly-3-hexyl-thiophene , 2003 .

[8]  Marc P Y Desmulliez,et al.  Lab-on-a-chip based immunosensor principles and technologies for the detection of cardiac biomarkers: a review. , 2011, Lab on a chip.

[9]  K. Ng,et al.  The Physics of Semiconductor Devices , 2019, Springer Proceedings in Physics.

[10]  Kai Zhu,et al.  Charge Transport and Recombination in Perovskite (CH3NH3)PbI3 Sensitized TiO2 Solar Cells , 2013 .

[11]  Nam-Gyu Park,et al.  Effects of Seed Layer on Growth of ZnO Nanorod and Performance of Perovskite Solar Cell , 2015 .

[12]  S. Sze,et al.  Physics of Semiconductor Devices: Sze/Physics , 2006 .

[13]  Guangda Niu,et al.  Review of recent progress in chemical stability of perovskite solar cells , 2015 .

[14]  Peng Gao,et al.  A molecularly engineered hole-transporting material for efficient perovskite solar cells , 2016, Nature Energy.