Journal
IEEE ELECTRON DEVICE LETTERS
Volume 33, Issue 3, Pages 399-401Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LED.2011.2182602
Keywords
Amorphous InGaZnO (a-IGZO); differential ideality factor; subgap density of states (DOS); subthreshold drain current; thin-film transistor (TFT)
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Funding
- Kookmin University
- NRF
- Ministry of Education, Science and Technology [2009-0080344, 2010-0013883]
- National Research Foundation of Korea [2010-0013883, 2009-0080344] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We propose a differential ideality factor technique (DIFT) for extraction of subgap density of states (DOS) over the bandgap in amorphous InGaZnO (a-IGZO) thin-film transistors (TFTs) by using the differential ideality factor d eta/dV(GS) on behalf of the ideality factor itself. Contrary to the subthreshold current method which requires an accurate threshold voltage (V-T), the DIFT is free from V-T itself and considerably useful to TFTs with a nonuniform distribution of DOS over the bandgap. Through the DIFT applied to an a-IGZO TFT with W/L = 200 mu m/30 mu m, the subgap DOS is extracted to be a superposition of exponential deep and tail states with N-DA = 7.1 x 10(15) cm(-3) . eV(-1), kT(DA) = 0.6 eV, N-TA = 1.5 x 10(16) cm(-3) . eV(-1), and kT(TA) = 0.024 eV.
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