How to deposit Pentacene by thermal evaporation method if we don't know the temerature of the boat. more temp might damage the Pentacene by exciting.

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Martin Weis Popular answer

Exactly speaking you don't need to know the boat temperature. The main parameter for the evaporation is the evaporation rate. In other words, you need to use the quartz crystal microbalance (QCM) to monitor the evaporation rate and the total thickness. Hence, you can slowly increase the temperature of the boat (or crucible) until the evaporation rate is not reaching required level. Fortunately, the pentacene has quite low sublimation temperature in comparison with temperature required for molecule fragmentation. Therefore, the evaporation without measuring of the temperature is still possible.

Martin Weis

Eric Nallon

I agree with Martin Weis. Make sure you have a QCM to measure evaporation rate and ramp the power slowly, then develop your own recipe based independent of temperature. Once the small molecule organics begin to sublime the rate really takes off. I have had the most success with a box heater (kurt lesker) and alumina or boron nitride crucible.