Citation:
	            
		            Bing  Cai, Wen-Hua  Zhang, Jieshan  Qiu. Solvent engineering of spin-coating solutions for planar-structured high-efficiency perovskite solar cells[J]. Chinese Journal of Catalysis,
							;2015, 36(8): 1183-1190.
						
							doi:
								10.1016/S1872-2067(15)60929-9
						
					
				
					
				
	        
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	                	Control of the morphology and coverage of high-quality perovskite films is the main issue affecting planar-structured perovskite solar cells fabricated by solution processing. In this work, the solvent engineering of mixed solutions for spin-coating uniform perovskite thin films was investigated in detail by adding different ratios of N,N-dimethylformamide (DMF) or γ-butyrolactone (GBL) to dimethyl sulfoxide (DMSO). The morphology and film thickness of the resulting perovskite films were found to be significantly altered. At 20%~40% (volume fraction) of N,N-dimethylformamide mixed with DMSO, micrometer scale grains and reduced grain boundaries were observed on the highly uniform perovskite thin films. The optimized planar-structured perovskite solar cells showed power conversion efficiency as high as 16.5% and a stabilized efficiency of 14.4% at a fixed forward bias of 0.88 V.
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								Keywords:
								
 - Perovskite,
 - Film,
 - Solar cell,
 - Solvent engineering,
 - Morphology,
 - Device performance
 
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