27467
Ultrahigh responsivity ( 0 . 57 A / W ) of few - layer MoS2 at 532 nm is due to the high optical absorption ( ~ 10 % despite being less than 2 nm in thickness ) and a high photogain , which sets up a new record that was not achievable in 2D nanomaterials previously .
 MoS2
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 MoS2