17432
Experimental results show that the lateral extents of space charge regions within these devices are approximately 1 - 5 mu m , which are related to the drift lengths of the charge carriers , and that the mechanism of bimolecular recombination is shown to be a bulk material property .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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