Persistent photoconductivity effects in printed n-channel organic transistors

Persistent photoconductivity of top-gate n-type organic transistors is investigated. The irradiation of green light leads to a negative shift in transistor threshold voltage and an increase in sub-threshold current. These light-induced effects are enhanced when the gate is negatively biased during the light irradiation, and the recovery process is faster at 60 °C than at 25 °C. After storage in dark, full recovery is obtained for a transistor printed with a neat semiconductor, whereas for the device printed with a solution of the same semiconductor mixed with an insulator, only partial recovery is observed after four days at room temperature. Other stress conditions (irradiation with a positive gate bias, irradiation without bias, and bias under dark) do not change the threshold voltage or the sub-threshold current significantly. We attribute this photo phenomenon to holes trapped and released at the dielectric/semiconductor interface and a smaller number of positive fixed charges generated in the bulk of...

[1]  Tse Nga Ng,et al.  Comparison of Static and Dynamic Printed Organic Shift Registers , 2013, IEEE Electron Device Letters.

[2]  Yasuo Kimura,et al.  Photoinduced Doping of Organic Field Effect Transistors Studied by Displacement Current Measurement and Infrared Absorption Spectroscopy in Multiple Internal Reflection Geometry , 2006 .

[3]  R. Street.  Thin‐Film Transistors , 2009 .

[4]  Tse Nga Ng,et al.  Characterization of Charge Collection in Photodiodes under Mechanical Strain: Comparison between Organic Bulk Heterojunction and Amorphous Silicon , 2009 .

[5]  Zhenan Bao,et al.  Organic Field-Effect Transistors , 2007 .

[6]  Robert A. Street,et al.  Surface‐Induced Self‐Encapsulation of Polymer Thin‐Film Transistors , 2006 .

[7]  Luciano Vicari,et al.  Photoinduced long-term memory effects in n-type organic perylene transistors , 2009 .

[8]  Hideo Hosono,et al.  Interface and bulk effects for bias—light‐illumination instability in amorphous‐In—Ga—Zn—O thin‐film transistors , 2010 .

[9]  E. Fortunato,et al.  Oxide Semiconductor Thin‐Film Transistors: A Review of Recent Advances , 2012 .

[10]  A. Arias,et al.  Author ' s personal copy Organic inkjet-patterned memory array based on ferroelectric field-effect transistors , 2011 .

[11]  D. Knipp,et al.  Electric‐Field‐Induced Gap States in Pentacene , 2009 .

[12]  Tse Nga Ng,et al.  Organic inkjet-patterned memory array based on ferroelectric field-effect transistors , 2011 .

[13]  Jiyoul Lee,et al.  Enhanced electrical stability of organic thin-film transistors with polymer semiconductor-insulator blended active layers , 2012 .

[14]  Sanjiv Sambandan,et al.  Compact model for forward subthreshold characteristics in polymer semiconductor transistors , 2009 .

[15]  E. Fortunato,et al.  Oxide Semiconductor Thin‐Film Transistors: A Review of Recent Advances , 2012, Advanced materials.

[16]  J. Northrup,et al.  Two-dimensional deformation potential model of mobility in small molecule organic semiconductors , 2011 .

[17]  Sanjiv Sambandan,et al.  Electrical stability of inkjet-patterned organic complementary inverters measured in ambient conditions , 2009 .

[18]  H. Matsui,et al.  Inkjet printing of single-crystal films , 2011, Nature.

[19]  Robert A. Street,et al.  Light-induced bias stress reversal in polyfluorene thin-film transistors , 2003 .

[20]  U. Chung,et al.  Metal Oxide Thin Film Phototransistor for Remote Touch Interactive Displays , 2012, Advanced materials.

[21]  T. M. Klapwijk,et al.  Dopant density determination in disordered organic field-effect transistors , 2003 .

[22]  Nripan Mathews,et al.  Steady-state and transient photocurrents in rubrene single crystal free-space dielectric transistors , 2007 .

[23]  Sanjiv Sambandan,et al.  Flexible image sensor array with bulk heterojunction organic photodiode , 2008 .

[24]  Thomas D Anthopoulos,et al.  Air‐Stable and High‐Mobility n‐Channel Organic Transistors Based on Small‐Molecule/Polymer Semiconducting Blends , 2012, Advanced materials.

[25]  Tse Nga Ng,et al.  Scalable printed electronics: an organic decoder addressing ferroelectric non-volatile memory , 2012, Scientific Reports.

[26]  Benjamin J. Norris,et al.  ZnO-based transparent thin-film transistors , 2003 .

[27]  Antonio Facchetti,et al.  n-Channel semiconductor materials design for organic complementary circuits. , 2011, Accounts of chemical research.

[28]  Jin Jang,et al.  Dependence of persistent photocurrent on gate bias in inkjet printed organic thin-film transistor , 2010 .

[29]  E. Calvetti,et al.  Analytical model for organic thin-film transistors operating in the subthreshold region , 2005 .

[30]  Nitesh Kumar,et al.  Light responsive polymer field-effect transistor , 2001 .

[31]  Xiao Hu,et al.  Influence of trapping states at the dielectric–dielectric interface on the stability of organic field-effect transistors with bilayer gate dielectric , 2011 .

[32]  U-In Chung,et al.  Persistent photoconductivity in Hf–In–Zn–O thin film transistors , 2010 .

[33]  Tse Nga Ng,et al.  Degradation mechanisms of organic ferroelectric field-effect transistors used as nonvolatile memory , 2009 .