2079
Without using additional transparent conducting oxide ( TCO ) substrates , this unique feature of the film boosts the incident photon - to - electron conversion efficiency to 32 % , outperforming TiO ( 2 ) nanoparticle electrodes fabricated on TCO substrates .
 Chemical: oxide; Chemical: TiO ( 2 )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: oxide; Chemical: TiO ( 2 )