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A facile route to grain morphology controllable perovskite thin films towards highly efficient perovskite solar cells
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Organic chemistry.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0001-8084-1181
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-1591-5815
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Theoretical Chemistry and Biology.
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2018 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 53, p. 405-414Article in journal (Refereed) Published
Abstract [en]

Perovskite photovoltaics have recently attracted extensive attention due to their unprecedented high power conversion efficiencies (PCEs) in combination with primitive manufacturing conditions. However, the inherent polycrystalline nature of perovskite films renders an exceptional density of structural defects, especially at the grain boundaries (GBs) and film surfaces, representing a key challenge that impedes the further performance improvement of perovskite solar cells (PSCs) and large solar module ambitions towards commercialization. Here, a novel strategy is presented utilizing a simple ethylammonium chloride (EACl) additive in combination with a facile solvent bathing approach to achieve high quality methyammonium lead iodide (MAPbI3) films. Well-oriented, micron-sized grains were observed, which contribute to an extended carrier lifetime and reduced trap density. Further investigations unraveled the distinctively prominent effects of EACl in modulating the perovskite film quality. The EACl was found to promote the perovskite grain growing without undergoing the formation of intermediate phases. Moreover, the EACl was also revealed to deplete at relative low temperature to enhance the film quality without compromising the beneficial bandgap for solar cell applications. This new strategy boosts the power conversion efficiency (PCE) to 20.9% and 19.0% for devices with effective areas of 0.126 cm2 and 1.020 cm2, respectively, with negligible current hysteresis and enhanced stability. Besides, perovskite films with a size of 10 × 10 cm2, and an assembled 16 cm2(5 × 5 cm2 module) perovskite solar module with a PCE of over 11% were constructed.

Place, publisher, year, edition, pages
2018. Vol. 53, p. 405-414
Keywords [en]
Perovskite solar cells, Ethylammonium chloride, Large grains, Additive engineering, Solvent bathing, Perovskite solar module
National Category
Materials Engineering Nano Technology
Research subject
Chemistry; Physics
Identifiers
URN: urn:nbn:se:kth:diva-234552DOI: 10.1016/j.nanoen.2018.08.072ISI: 000448994600045Scopus ID: 2-s2.0-85052970311OAI: oai:DiVA.org:kth-234552DiVA, id: diva2:1246302
Note

QC 20180910

Available from: 2018-09-07 Created: 2018-09-07 Last updated: 2018-11-16Bibliographically approved

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Zhang, FuguoCong, Jiayan

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Zhang, FuguoCong, JiayanLi, YuanyuanBergstrand, JanLiu, HaichunHajian, AlirezaYao, ZhaoyangWang, LinqinHao, YanGardner, James M.Ågren, HansWidengren, JerkerKloo, Lars
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Organic chemistryApplied Physical ChemistryFibre- and Polymer TechnologyWallenberg Wood Science CenterTheoretical Chemistry and BiologyApplied PhysicsChemistry
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