Study on optical band gap of boron-doped nc-Si : H film

The optical band gap (E-g) of the boron (B)-doped hydrogenated nano-crystalline silicon (nc-Si:H) films fabricated using plasma enhanced chemical vapor deposition (PECVD) was investigated in this work. The transmittance of the films were measured by spectrophotometric and the E-g was evaluated utilizing three different relations for comparison, namely: alphahnu=C(hnu-E-g)(3), alphahnu=B-0(hnu-E-g)(2), alphahnu=C-0(hnu-E-g)(2). Result showed that E-g decreases with the increasing of Boron doping ratio, hydrogen concentration, and substrate's temperature (T-s), respectively. E-g raises up with rf power density (P-d) from 0.45W.cm(-2) to 0.60w.cm(-2) and then drops to the end. These can be explained for E-g decreases with disorder in the films

Predictors of protected sexual intercourse (n = 1851).

<p>Predictors of protected sexual intercourse (n = 1851).</p

Main characteristics of the study population as a function of year.

<p>* Chi-squared for trend. For sexual intercourse details, each group was compared to all the other sexual intercourses.</p><p>Main characteristics of the study population as a function of year.</p

Ability of participants to obtain an interpretable result using the finger-stick whole-blood self-test and the information notice in a supervised setting.

<p>Ability of participants to obtain an interpretable result using the finger-stick whole-blood self-test and the information notice in a supervised setting.</p

Satisfaction questionnaire.

<p>Satisfaction questionnaire.</p

Ability of participants to read and interpret the HIV self-test results using a chart from a panel of 6 standardized tests.

<p>Ability of participants to read and interpret the HIV self-test results using a chart from a panel of 6 standardized tests.</p

History of occupational blood exposure (OBE) among Health workers of different occupational categories compared to administrative personnel at Niamey’s National Hospital, Niger, 2009.

<p>RR, relative risk; 95% CI, 95% confidence interval.</p

HBV serology in personnel (n = 207) at Niamey’s National Hospital, Niger, 2009.

<p>Pos, seropositive; Neg, seronegative; –, not performed; 95%CI, 95% confidence interval.</p

Characteristics of personnel (n = 207) at Niamey’s National Hospital, Niger, 2009.

<p>Characteristics of personnel (n = 207) at Niamey’s National Hospital, Niger, 2009.</p

Interactions between 82 healthcare workers and 54 patients placed under airborne precautions.

<p>Abbreviations: IQR, interquartile range; HCW, Healthcare worker.</p