title: On the Role of Interfaces in Planar-Structured HC(NH2 )2 PbI3 Perovskite Solar Cells.
abstract: Planar-structured HC(NH2 )2 PbI3 (FAPbI3 ) perovskite solar cells were prepared via a two-step deposition process. To investigate the role of interface, the perovskite morphology was intentionally modified by varying HC(NH2 )2 I concentration. Surface and grain sizes of the deposited FAPbI3 became rougher and larger as the HC(NH2 )2 I concentration decreased from 58.2 to 40.7 mM. Average photocurrent was improved but photovoltage deteriorated slightly with decreasing concentration. Consequently, the average efficiency was improved from 7.82 % to 10.70 % and the best efficiency of 12.17 % was obtained at 40.7 mM. Photoluminescence (PL) at TiO2 /FAPbI3 interface was reduced with decreasing concentration, which was, however, reversed at FAPbI3 /spiro-MeOTAD one. By correlating PL data and the photovoltaic performance, we concluded that the TiO2 /perovskite interface plays a crucial role in determining photocurrent while the perovskite/spiro-MeOTAD interface is important in governing photovoltage.
authors.affiliation: School of Chemical Engineering and Department of Energy Science', Sungkyunkwan University, Suwon 440-746 (Korea).
authors.forename: Dong-Jin
authors.initials: DJ
authors.lastname: Seol
authors.affiliation: School of Chemical Engineering and Department of Energy Science', Sungkyunkwan University, Suwon 440-746 (Korea).
authors.forename: Jin-Wook
authors.initials: JW
authors.lastname: Lee
authors.affiliation: School of Chemical Engineering and Department of Energy Science', Sungkyunkwan University, Suwon 440-746 (Korea). npark@skku.edu.
authors.forename: Nam-Gyu
authors.initials: NG
authors.lastname: Park
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D056831:Coordination Complexes / Q000737:chemistry*; D003959:Diamines / Q000737:chemistry*; D011211:Electric Power Supplies; D005461:Fluorine / Q000737:chemistry; D006046:Gold / Q000737:chemistry; D010087:Oxides / Q000737:chemistry*; D012993:Solar Energy; D017971:Tin Compounds / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D056831:Coordination Complexes; D003959:Diamines; D010087:Oxides; D017971:Tin Compounds; C059910:perovskite; C009495:titanium dioxide; D005461:Fluorine; D006046:Gold; D014025:Titanium; C045358:stannic oxide
keywords: formamidinium lead iodide; interfacial role; perovskite solar cell; photoluminescence; two-step deposition