13231
We report on singlet - singlet annihilation and exciton diffusion in as - prepared p - type and annealed n - type thin films of the low - bandgap quinoidal quaterthiophene [ QQT ( CN ) 4 ] using ultrafast transient absorption measurements .
 quinoidal quaterthiophene, QQT ( CN ) 4
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
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Answer:
 quinoidal quaterthiophene, QQT ( CN ) 4