id	keyword
american_scientific_journal-8568	zno
american_scientific_journal-8568	perovskite
american_scientific_journal-8568	cells
american_scientific_journal-8568	electron
american_scientific_journal-8568	materials
american_scientific_journal-8568	layer
american_scientific_journal-8568	efficiency
american_scientific_journal-8568	transport
american_scientific_journal-8568	surface
american_scientific_journal-8568	films
american_scientific_journal-8568	tio2
american_scientific_journal-8568	thin
american_scientific_journal-8568	research
american_scientific_journal-8568	method
american_scientific_journal-8568	energy
american_scientific_journal-8568	performance
american_scientific_journal-8568	pscs
american_scientific_journal-8568	figure
american_scientific_journal-8568	zno electron
american_scientific_journal-8568	et al
american_scientific_journal-8568	device
american_scientific_journal-8568	journal
american_scientific_journal-8568	engineering