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New Sample I-V , PL & PLE

New Sample I-V , PL & PLE. Toshiyuki Ihara ’04 07/05. Sample information. n-type-doped single wire 5_7_04.1 (accumulation) 5_7_04.2 (depletion). I measured I-V of sample 5_7_04.1 #1,#5 and 5_7_04.2 #3 PL & PLE spectra of 5_7_04.1 #1 are novel data.

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New Sample I-V , PL & PLE

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  1. New Sample I-V , PL & PLE Toshiyuki Ihara ’04 07/05

  2. Sample information • n-type-doped single wire 5_7_04.1(accumulation) 5_7_04.2 (depletion) I measured I-V of sample 5_7_04.1 #1,#5 and 5_7_04.2 #3 PL & PLE spectra of 5_7_04.1 #1are novel data. (I have shown the PL data of sample 5_7_04.1 #5)

  3. I-V measurement introduction • I applied 4 electrodes to each sample • A,B : Gate • C,D : Earth (stem) • I measured I-V between these 4 electrodes at the temperature of 5K and 300K. • However, I found that some electrodes don’t work properly because of insulations.

  4. I-V measurement • Sample 5_7_04.1 #5 (accumulation) A-B (gate–gate) A-C (gate–earth) 300K C-D (earth–earth) 300K 5K 300K

  5. I-V measurement • Sample 5_7_04.1 #1 (accumulation) • Small leak current 80nA / 0.8V at 5K 300K 5K

  6. I-V measurement • Sample 5_7_04.2 #3 (depletion) • Gate-earth I-V : Ohmic current… • Process failure? • Nature of high-dope sample(accumulation)?? 300K

  7. PL & PLE measurement introduction • I measured PL scan, wire & arm PL and PLE Vg dependence of sample 5_7_04.1 #1(depletion type) • It is hard to measure PLE spectra by previous method ( integral all emission aria) because it is very difficult to decrease the scattered laser. • I changed integral aria from all emission to low energy tail.

  8. PL scan ～ sample quality 0 - 100μm (1μm step) Vg = 0.25V Laser 10μW stem excitation (1.665eV) Reflection geometry Still some ML fluctuations…

  9. Wire PL & PLE Vg dependence Wire normalized PL & PLE spectra Almost same result as before (for ICPS) ①exciton blue shift ② trion doesn’t shift ③ Ex – Ex- increases ④trion→plasma (0.3V - 0.5V) ⑤PLE shape at high voltage (0.8V) ※No irregular PLE absorption peak (arrow) ※ BOWA Integral aria FES X- X This is because the PL integral aria is narrow (low energy tail )

  10. Arm PL & PLE Vg dependence Arm well normalized PL & PLE spectra Not the same result as before ①cannot resolve X absorption and X- absorption ② PL peak (unknown origin) ② X- ① X

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