question: Why is hydrogen employed ?
answer: to saturate broken ( `` dangling '' ) bonds of amorphous silicon and amorphous carbon that helps stabilizing material properties
turker_answer: Hydrogen is employed to saturate broken ( `` dangling '' ) bonds of amorphous silicon and amorphous carbon that helps stabilizing material properties .
rule-based: Hydrogen is employed to saturate broken ( `` dangling '' ) bonds of amorphous silicon and amorphous carbon that helps stabilizing material properties .