摘要： PC61BM used as a common electron selective material has been widely discussed in previous articles. However, the inferior film coverage of PC61BM using chlorobenzene (CB) solvent still restricts the photoelectric property of the perovskite solar cells (PSCs). In this paper, the effect of 1,2-dichlorobenzene (o-DCB) used as the solvent of PC61BM precursor is investigated in order to get an efficient method to fabricated high-quality PC61BM layer which is crucial for low-temperature PSCs. Furthermore, the morphologies of diverse PC61BM layers using CB and o-DCB solvents and the properties of perovskite films deposited on different PC61BM substrates are studied. For the performance of PSCs based on the PC61BM layers fabricated by CB and o-DCB, the optimal PC61BM concentrations in precursor are 15 mg/mL and 20 mg/mL, respectively. In all samples, the champion PSCs based on 20 mg/mL PC61BM layer using o-DCB with the structure of fluorine-doped tin oxide (FTO) substrate/compact TiO2/ PC61BM/FAxMA1-xPbIyBrzCl3-y-z/2,2',7,7'-tetrakis- (N,N-di-p-methoxyphenylamine) -9,9'-spirobifluorene (Spiro-OMeTAD)/Au are prepared. It has achieved a power conversion efficiency (PCE) of 16.17% compared with that from the sample without PC61BM layer (8.34%) and the device with 15 mg/mL PC61BM layer using CB solvent (14.03%). We anticipate that the introduction of o-DCB would possibly become a promising method for high efficient PSCs in the future.