id	keyword
ap-6888	cell
ap-6888	energy
ap-6888	power
ap-6888	rse
ap-6888	thermal
ap-6888	pv cell
ap-6888	heat
ap-6888	solar
ap-6888	figure
ap-6888	module
ap-6888	photovoltaic
ap-6888	system
ap-6888	temperature
ap-6888	resistance