Oriented Crystal Growth during Perovskite Surface Reconstruction

Surface passivation has become a key strategy for an improvement in power conversion efficiency (PCE) of perovskite solar cells (PSCs) since PSCs experienced a steep increase in PCE and reached a comparably matured point. Recently, surface passivation using a mixed salt of fluorinated alkyl ammonium iodide and formamidinium bromide demon-strated a remarkable improvement in both performance and stability, which can be tuned by the length of the alkyl chain. Nevertheless, the role of the alkyl chain in manipulating surface-limited crystal growth was not fully understood, preventing a further progress in interface control. In this study, we found that the length of the fluorine-substituted alkyl chain governed the crystal formation dynamics by manipulating surface tensions of different crystal orientations. The overall enhancement of the (001) plane, being the most favored, commonly resulted from the surface reformation of the perovskite film regardless of the chain length, while the highly oriented (001) over (111) was monitored with a particular chain length. The enhanced crystal orientation during surface recrystallization was responsible for the low trap density and thus effectively suppressed charge recombination at the interface, resulting in a considerable increase in open-circuit voltage and fill factor.

Kim, Yu-NaInha Univ, Dept Chem, Incheon 22212, South Korea. (författare)
Hong, SeungyeonPusan Natl Univ, Sch Chem Engn, Dept Organ Mat Sci & Engn, Pusan 46241, South Korea. (författare)
Yang, BowenUppsala universitet,Fysikalisk kemi(Swepub:uu)bowya118 (författare)
Suo, JiajiaUppsala universitet,Fysikalisk kemi(Swepub:uu)jiasu737 (författare)
Seo, Ji-YounPusan Natl Univ, Dept Nano Fus Technol, Pusan 46241, South Korea. (författare)
Kwon, Seok JoonSungkyunkwan Univ, Sch Chem Engn, Suwon 16419, South Korea.;Sungkyunkwan Univ, SKKU Inst Energy Sci & Technol SIEST, Suwon 16419, South Korea. (författare)
Hagfeldt, AndersUppsala universitet,Fysikalisk kemi(Swepub:uu)andehagf (författare)
Kim, Hyo JungPusan Natl Univ, Sch Chem Engn, Dept Organ Mat Sci & Engn, Pusan 46241, South Korea. (författare)
Lee, Wan InInha Univ, Dept Chem, Incheon 22212, South Korea. (författare)
Kim, Hui-SeonInha Univ, Dept Chem, Incheon 22212, South Korea. (författare)
Inha Univ, Dept Chem, Incheon 22212, South Korea.Pusan Natl Univ, Sch Chem Engn, Dept Organ Mat Sci & Engn, Pusan 46241, South Korea. (creator_code:org_t)

Ingår i:ACS Applied Materials and Interfaces: American Chemical Society (ACS)14:45, s. 51149-511561944-82441944-8252

Av författaren/redakt...: Choi, Hyeon-Seo; Kim, Yu-Na; Hong, Seungyeon; Yang, Bowen; Suo, Jiajia; Seo, Ji-Youn; visa fler...; Kwon, Seok Joon; Hagfeldt, Anders; Kim, Hyo Jung; Lee, Wan In; Kim, Hui-Seon; visa färre...

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