Lee, Jin-Wook Park, Sungmin Ko, Min Jae Son, Hae Jung Park, Nam-Gyu 2024-01-20T09:03:10Z 2024-01-20T09:03:10Z 2021-09-02 2014-08-25 1439-4235 https://pubs.kist.re.kr/handle/201004/126449 A dichlorobenzene-functionalized hole-transporting material (HTM) is developed for a CH3NH3PbI3-based perovskite solar cell. Notwithstanding the similarity of the frontier molecular orbital energy levels, optical properties, and hole mobility between the functionalized HTM [a polymer composed of 2'-butyloctyl-4,6-dibromo-3-fluorothieno[3,4-b]thiophene-2-carboxylate (TT-BO), 3',4'-dichlorobenzyl-4,6-dibromo-3-fluorothieno[3,4-b]thiophene-2-carboxylate (TT-DCB), and 2,6-bis(trimethyltin)-4,8-bis(2-ethylhexyloxy)benzo[1,2-b:4,5-b']dithiophene (BDT-EH), denoted PTB-DCB21] and the nonfunctionalized polymer [a polymer composed of thieno[3,4-b]thiophene (TT) and benzo[1,2-b:4,5-b']dithiophene (BDT), denoted PTB-BO], a higher power conversion efficiency for PTB-DCB21 (8.7%) than that for PTB-BO (7.4%) is achieved because of a higher photocurrent and voltage. The high efficiency is even obtained without including additives, such as lithium bis(trifluoromethanesulfonyl)imide and/or 4-tert-butylpyridine, that are commonly used to improve the conductivity of the HTM. Transient photocurrent-voltage studies show that the PTB-DCB21-based device exhibits faster electron transport and slower charge recombination; this might be related to better interfacial contact through intermolecular chemical interactions between the perovskite and the 3,4- dichlorobenzyl group in PTB-DCB21. English WILEY-V C H VERLAG GMBH SPIRO-OMETAD DYE EFFICIENCY MECHANISM ELECTRON FILM Enhancement of the Photovoltaic Performance of CH3NH3PbI3 Perovskite Solar Cells through a Dichlorobenzene-Functionalized Hole-Transporting Material Article 10.1002/cphc.201402033 1 CHEMPHYSCHEM, v.15, no.12, pp.2595 - 2603 CHEMPHYSCHEM 15 12 2595 2603 scie scopus 000340480600026 2-s2.0-84906063023 Chemistry, Physical Physics, Atomic, Molecular & Chemical Chemistry Physics Article SPIRO-OMETAD DYE EFFICIENCY MECHANISM ELECTRON FILM electrochemistry polymers perovskite phases semiconductors solar cells