I Am Working On Some Solar Cell Technology And Working On Some Photoconductivity (current-time) Graph.?
I Am Working On Some Solar Cell Technology And Working On Some Photoconductivity (current time) Graph.?
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I am working on a solar cell technology and work in some photoconductivity (current-time) chart.?
The graph consists an exponential growth curve which then fall (decay). Can anyone tell me how to find the time constants of rise and fall time of this graph today?
I can think of 2 ways. 1. For the rise time, find the value of the "minimum" and find the value set the "maximum". Take the difference. (If the minimum value is zero, then the difference is the maximum.) Taking 36.8% of the difference. Find the time at which the value is 36.8%. From the moment that begins to increase when the value is 36.8% of max. - What is the rise time constant. For the decay time constant, use 63.2% (which is 100% - 36.8%) 2. Enter details of the graph in Excel spreadsheet. The appropriate portions using XY Scatter Chart. Do a trend line analysis of parts of the graph using the exponential function. The time constant is shown in the equation ..
July 14th, 2009 - 16:11
I can think of 2 ways.
1. For the rise time, find the ‘minimum’ value and find the ‘maximum’ settled value. Take the difference. (If the minimum value is zero, then the difference is the settled max.) Take 36.8% of the difference. Find the time where the value is at 36.8%. From the time the rise starts until the time where the value is at 36.8% of max. — that’s the rise time constant.
For the fall time constant, use 63.2% (which is 100% – 36.8%)
2. Enter the data from the graph into an Excel spreadsheet. Graph the appropriate portions using X-Y scatter. Do a trendline analysis on those portions of the graph using the exponential function. The time constant will be displayed in the equation.
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