Gyanendra Bhattarai

12 Questions 14 Answers 0 Followers

Questions related from Gyanendra Bhattarai

Does absorption oscillate due to interference?

In UV-VIS analysis of a thin film, suppose we measure Reflectance and absorbance. Absorbance sometimes can be different in meaning. Some instruments include the reflectance in the absorbance, and...

16 April 2021 3,742 3 View

Why 'sccm' is a standard term for measuring flow rate of many liquid and solid precursors which are not in gas phase at STP?

Suppose a chemist performing thin film deposition used 10 sccm of water vapor during the process. Now, he needs to calculate how many grams of water he used per minute. By definition, sccm is...

07 August 2020 9,541 0 View

What are the generally used techniques to determine carrier mobility in bulk materials?

The generally used methods of determining charge carrier mobility in thin films (Time of Flight TOF, steady state SCLC analysis, Transient SCLC (Dark injection) , Carrier Extraction by Linearly...

23 September 2016 7,025 0 View

What is difference between an integrator with feedback resistance and a transimpedance amplifier with compensating capacitor?

I am dealing with both type of amplifiers 1. Integrator (chrage sensetive amplifier) and 2. Transimpedance amplifier (current sensative). Ideal case of these two amplifiers are completely...

27 July 2016 1,551 16 View

Any suggestions of references for transient photocurrent (like TOF) in amorphous semiconductors with uniform absorption?

I am dealing with amorphous semiconductor films (thickness of the orders of 1-2 microns). A true TOF experiment (where the pulsed light creates a thin sheet of e-h pairs) is difficult because the...

15 February 2016 7,388 2 View

Which dielectric constant should you use in Poole-Frenkel Emission?

In the derivation of Poole-Frenkel emission (Field assisted thermal emission), the trap barrier is lowered due to applied field and is given as Delta U = sqrt((e^3/ pi*\epsilon)*E) where E is...

07 December 2015 949 2 View

Can anyone suggest a good book on the conduction mechanism in insulators/semiconductors?

I am searching for a text book with theoretical derivations of different types of conduction mechanism in insulators like Schottky emission, thermionic emission, poole-frenkel emission, Hopping...

22 November 2015 2,798 4 View

What is the minimum current that standard pre-amplifiers detect and integrate?

I saw some pre-amplifier specifications and all of them say noise in terms of energy ( for example 2.8 keV for Si). If I convert this energy to charge (4eV per e-h pair in silicon) and convert the...

16 October 2015 4,664 2 View

Do UV-VIS spectrometers take care of reflectance?

Trying to obtain absorption coefficient from absorbance data. (HP 8453 Spectrometer). When a UV-VIS spectrometer measures absorbance as A = log10(I0/I) how does it determine that the loss in the...

03 June 2015 6,403 5 View

How do holes recombine with electrons in single carrier type steady state conduction?

Suppose that e-h pairs are generated on anode surface of an insulator by surface absorption of light. some of the electrons recombine there in surface very shortly. The remaining electrons are...

19 February 2015 2,533 3 View

How to perform load compensation in Agillent 4294A analyzer?

I am measuring capacitance of a capacitor. The open compensation and short compensation is straightforward. But I am not being able to perform/understand the load compensation. I really do not...

20 July 2014 7,987 1 View

Can anyone help with fixture compensation in Agilent 4294A?

I am measuring impedance data with Agilent Analyzer 4294A with a custom built fixture. After performing both open and short fixture compensation, when I measure the impedance between open...

21 April 2014 4,803 7 View