Journal
NANOSCALE ADVANCES
Volume 1, Issue 1, Pages 76-85Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8na00052b
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Funding
- MOTIE (Ministry of Trade, Industry Energy) [10052044]
- KDRC (Korea Display Research Corporation) support program
- Korea Evaluation Institute of Industrial Technology (KEIT) [10052044] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Perovskite solar cells have attracted significant attention due to their high efficiency and low cost. In the research on methylammonium lead-iodide (CH3NH3PbI3), a lot of work has been devoted to optimize the film morphology and crystallinity resulting in an enhancement of the power conversion efficiency (PCE). A good surface coverage and uniform perovskite films are highly desirable along with a smooth and pinhole-free contact between the hole and electron extraction layers. Overall, this affects the charge transport and collection, and reduces charge recombination. Herein, we demonstrate a facile route to control perovskite crystallization by inserting an optimal amount of insulating polystyrene in the perovskite precursor solutions. The incorporation of a small amount of polystyrene results in much better surface coverage, and a smoother and uniform perovskite thin film leading to improved crystallization and larger grain size. Via careful optimization, and easy and low temperature solution-based processing, below 100 degrees C, we realize a device with PCE exceeding 13% along with significantly reduced leakage current.
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