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We demonstrated that incorporation of octadecyltrimethoxysilane ( OTMS ) functionalized , spectrally tuned , gold / silica ( Au / SiO2 ) core / shell nanospheres and nanorods into the active layer of an organic photovoltaic ( OPV ) device led to an in increase photo conversion efficiency ( PCE ) .
 Chemical: octadecyltrimethoxysilane; Chemical: OTMS; Chemical: silica; Chemical: Au; Chemical: SiO2
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: octadecyltrimethoxysilane; Chemical: OTMS; Chemical: silica; Chemical: Au; Chemical: SiO2