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1. potential for bugs in this area largely resulting from the different kinds of printers and would like to know about them 2 Macros You can now perform a series of calculations i e l V curves and examine the results There is also a large potential for bugs in this area The only macro available is the voltage macro where the applied contact potential is changed Different kinds of macros i e temperature input optical frequency input optical intensity will appear in later versions 3 Band gap and thermal conductivity These two parameters are now temperature dependent The material prm file has been expanded to allow values to be varied which controls the dependence of these parameters on temperature 4 Lateral Heat flow My model for lateral heat flow now has a user interface This models assumes that the device is cylindrical with a specified radius and the environment temperature surrounds the device in a cylindrical geometry Heat flow is calculated in the direction along the device as well as laterally out to the environment This option can of course be turned off 5 Contacts and Surfaces The contacts dialog box has been split into contacts and surfaces This will allow the future feature of having contacts that are not necessarily at the same location as the device surface 6 Freeze Plot Plots can be frozen and melted When a plot is frozen the data is not updated when the state of the device changes This al2. Trace Window It is now possible to get information directly off of plots Select the plot window and then choose Show trace window from the Plot menu A trace window will be display As you move the pointer across the plot the corresponding data will be displayed in the window d Improved Scale dialog box An operation for the y data as been added to the scale dialog box This was added because of the problem of plotting both positive and negative data on a log plot For example the total recombination rate can be both positive and negative but it is also desireable to view it on a log plot Therefore if any data is less than or equal to zero then it not be drawn on the plot To view this data select the y option This will then show the negative of the data An abs y option is also available to view the absolute value of the data
3. K However numerical problems may appear depending on the device and temperature 7 Gridpoints on Plots The actual location of grid points can be viewed on plots by choosing the Plot Show Nodes menu option 8 Thermionic emission energy flow bug There was a bug that affected the energy flow associated with thermionic emission current That has been corrected 9 Creating a device with error bug If a device had been generated and a second device that had an error in the device file was generated the error message would not appear and SimWindows would crash That has been corrected SimWindows 16 v 1 2 0 updated on Sep 17 1995 at 21 18 42 SimWindows3z2 v 1 2 0 updated on Sep 17 1995 at 21 16 45 State Files are incompatible with older versions 1 General Functions General algebraic functions including exponential and trigonometric can be used in the material parameters file and the device file 2 Built in models A few material parameters have built in models that can be used if desired 3 Material Parameter Overrides Material Parameters can be overriden in the device file 4 Preferences There are more options available under Environment Preferences that can be changed and saved in a simwin ini file Simulation Parameters have been moved to the preferences 5 Simulation Undo When enabled it is possible to undo a simulation and return to the state just prior to the previous simulation 6 Trap Convergence Err
4. SimWindows16 v 1 4 2 updated on Apr 29 1996 at 13 53 00 SimWindows32 v 1 4 2 updated on Apr 29 1996 at 15 49 27 Note if this file appears to wide for your screen go to File Print Setup and choose portrait State Files are compatible with version 1 4 0 and 1 4 1 This version fixes six bugs found with version 1 4 1 1 Optical Generation Dialog Box After inputting a single wavelength and intensity if a new intensity is entered the dialog box would not use the new intensity That has been corrected 2 Thermal Conductivity The material parameters file had an incorrect model for the AlGaAs thermal conductivity 3 Optical Generation Spectrum and Hot Electrons There was a bug that incorrectly calculated the amount of energy supplied to electrons from an input optical spectrum It worked correctly for a single wavelength 4 State Window Under special conditions SimWindows would crash when generating a device That has been solved 5 Doping Statement If a doping statements are not in the device file SimWindows would crash SimWindows now defaults to intrinsic material if there are no doping statements 6 Data Column Headers Under special conditions when saving data from a plot to a file the column headers would not be written That has been solved SimWindows16 v 1 4 1 updated on Mar 19 1996 at 15 15 45 SimWindows32 v 1 4 1 updated on Mar 19 1996 at 15 13 15 State Files are compatible with versio
5. d and subsequent iterations were performed This has been corrected SimWindows16 v 1 0 1 Never Released SimWindows3z2 v 1 0 1 Never Released SimWindows16 version 1 0 0 updated on Jan 10 1995 at 17 22 42 SimWindows32 version 1 0 0 updated on Jan 10 1995 at 17 19 46 1 User interface The user interface has been completly redesigned It is much more sophisticated and robust Also this is the first release of SimWindows32 which is a 32 bit version that runs about twice as fast as SimWindows16 The new user interface has a price The exe files are now quite larger Simwin16 exe has increased by 300k to 860k Simwin32 exe is 650k However the result is well worth it The main features that have been added are a Multiple Windows SimWindows is a multiple document interface MDI application This means that more than one window can be created at one time So it is possible to see more than one plot and also edit more than one device file You can also iconify windows as well as arrange and tile them b Tool bar A tool bar is present which allows the most frequent functions to be executed easily c Flyby hints As you move the pointer over tools in the tool bar or over menu items hints for that particular item are displayed at the bottom of the screen d Input validation When you input values into dialog boxes they are checked to see if they fall within a certain range If they do not then a message is displayed c
6. for the intrinsic carrier concentration of a quantum well has been incorporated It modifies the value slightly when fermi dirac statistics are applicable 6 QW Energy level There was a bug that modified the quantum well energy levels slightly That has been fixed 7 Temperature Dependent Ref Index The default model for the index of refraction for AlGaAs has been made temperature dependent based on the temperature dependence of the band gap of the material 8 Modified Laser Parameters Laser parameters have been modified The cavity area has replaced the width and height The cavity length must now be specified The length is no longer the distance between the mirrors SimWindows16 v 1 3 1 updated on Dec 16 1995 at 16 51 53 SimWindows32 v 1 3 1 updated on Dec 16 1995 at 16 49 25 State Files are compatible with version 1 3 0 1 Optical Input Dialog Bugs Several bugs were found in the optical input dialog box which have been corrected The bugs are a Off button After turning the optical input on the off button did not work It would show off but the optical input was still on b Interface Reflection Button After checking on the interface reflections checking off the interface reflections had no affect c Single Wavelength Inputs If a state file was loaded with a spectrum present for example the pmqwn sta file included with SimWindows and you tried to turn off the optical input the Energy Wavelen
7. gth and Intensity edit boxes would incorrectly request a value SimWindows 16 v 1 3 0 updated on Nov 21 1995 at 21 21 08 SimWindows3z2 v 1 3 0 updated on Nov 21 1995 at 21 18 41 State Files are incompatible with older versions 1 Fermi Dirac Statistics There is the option of choosing either Boltzmann or Fermi Dirac statistics 2 Incomplete lonization The dopant level and the degeneracy factor can be specified in the device file The user can select to have the dopant completely ionized or only partially ionized 3 Collision Factors The Energy dependence on the momentum relaxation time the famous 1 2 1 2 3 2 etc can be specified in the material parameters file These coefficients end up by appearing in the non isothermal drift diffusion equations for both current and energy flux 4 Doping and Temperature Dependent Mobility The mobility is now dependent on the doping concentration as well as the carrier and lattice temperature A built in model is provided and is applied to Si The same model can be applied to other materials if desired 5 Temperature Dependent Electron Affinity The electron affinity is now temperature dependent By default the electron affinity increases by half the amount that the band gap decreases with temperature If effect the band gap narrowing is split evenly by the conduction and valence bands 6 Wider Temperature Ranges The environment temperature will accept values between 50 and 5 000
8. lows data for two different device states to be compared When the plot is melted the data is updated to reflect the current device state 7 Plot Parameters Any positionally dependent variable can now be plotted 8 Write Parameters Any combination of parameters can be now be written to a disk file 9 Operation There are a number of subtle changes in the operation of SimWindows For instance if the environment temperature is changed the state of the device is no longer reset to the initial solution It just needs to be resimulated in the present state 10 User Manual Included on the distribution disks is a postscript file of the present User Manual It is not complete yet but the finished sections are included 11 Windows NT SimWindows will now run on Windows NT SimWindows16 v 1 0 2 updated on Feb 1 1995 at 18 58 12 SimWindows32 v 1 0 2 updated on Feb 1 1995 at 18 55 20 State Files are incompatible with older versions 1 Bug fixes Version 1 0 2 is basically to fix a couple of bugs Note that version 1 0 1 was never released because discovered a virus on my system at about the time was ready to release version 1 0 1 The bugs that were fixed over v 1 0 are a New parameters entered in the laser dialog box are used in subsequent calculations b SimWindows works correctly on systems where the background window color is set to a non white color c SimWindows tended to crash if more than 4 plots were opene
9. n 1 4 0 This version fixes three bugs found with version 1 4 0 1 Tunneling Energy Flow A bug was found for the energy flux resulting from tunneling using Boltzmann statistics It produced strange discontinuities in the temperature 2 AlGaAs Electron DOS Mass There was an incorrect model used in the material parameters file It was correct for x lt 0 45 but incorrect for x gt 0 45 3 Silicon Absorption There was an incorrect model used in the material parameters file for the Silicon absorption It was incorrect for higher photon energies SimWindows16 v 1 4 0 updated on Mar 10 1996 at 19 14 32 SimWindows32 v 1 4 0 updated on Mar 10 1996 at 19 12 07 State Files are incompatible with version 1 3 1 1 Spectrum Multiplier A number can be specified in the optical input dialog box that will be multiplied to the input input spectrum This can be used to increase or decrease a spectrum without modifying the spectrum file 2 Hot Electrons Hot electrons are now incorporated in the thermal models dialog box SimWindows assumes that the hole and lattice temperatures are constant and the electron temperature can vary 3 Tunneling Current tunneling through thin barriers between different materials has be incorporated 4 Optical Generation cross term There was an incorrect equation for the optical generation rate when using incident reflections That has been fixed 5 QW Intrinsic concentration A new equation
10. ne number of the cursor when editting files 15 Multiple Plots from when Plotting Selected When choosing to plot selected parameters multiple plots are generated if multiple parameters are selected SimWindows16 v 1 1 1 updated on Apr 16 1995 at 21 56 46 SimWindows32 v 1 1 1 updated on Apr 16 1995 at 21 53 58 State Files are incompatible with older versions Version 1 1 1 fixes one important bug and uses the latest version of the O Setup Installer There is plenty of code work in preparation for hot carriers but those changes are user transparent 1 Thermal Equations Bug Fix The thermal equations contained a bug that affected the thermoelectric heat but NOT joule heating That problem has been fixed 2 New Installer The latest version of the O Setup Installer is now being used SimWindows16 v 1 1 0 updated on Mar 22 1995 at 12 21 33 SimWindows32 v 1 1 0 updated on Mar 22 1995 at 12 19 53 State Files are incompatible with older versions Version 1 1 0 of SimWindows is a relatively large evolutionary step from version 1 0 2 the last released version There have been many changes made to the code as well as features added hope that this has not introduced a large number of new bugs but there will probably be a couple of maintanence releases in the next couple of weeks Here is a list of the new features 1 Printing The contents of device state and plot windows can be printed There is a large
11. ors If a numerical problem results during simulations SimWindows will stop and allow you to reset the device or undo the simulation This is not 100 bullet proof but it is far better than when SimWindows would just crash 7 Interface Reflections For external optical generation and DBR lasers interface reflections have been added Reflection Transmission vs wavelength plots are now possible 8 DBR Laser Mode Search Given an initial guess for the lasing wavelength SimWindows can compute the optical field and actual lasing wavelength for a DBR laser and track it as a function of temperature 9 Hot electrons Code for solving the hot electron problem has been added However it is completely disabled until we are satisfied that it is working correctly 10 New Printer Driver There is a new printing routine for plots only hope this will fix problems that user s had experiences 11 Temperature Dependent Thermal Conductivity Bug Fix There was a bug when computing the temperature dependence on the thermal conductivity that reduced that conductivity too much for a given temperature 12 Frozen Plot Write Data Bug Fix There was a bug when saving data of a frozen plot It would output the actual data from the device rather than what was actually plotted 13 State File Checking If you try to load a state file from a previous version of SimWindows an error message results 14 Line Number Control The status bar now displays the li
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