Solution processed fullerene (C 60 ) films as the electron transport layers (ETLs) promise to substantially reduce the cost of the perovskite solar cells (PSCs). However, the self-aggregation nature of C 60 when dissolved in a solvent with high solubility (e.g., o-dichlorobenzene, o-DCB) makes the efficiency of the resulting PSCs lower than 18%. In this paper, we proposed a novel recipe of C 60 precursor solutions (XP-C 60 ) by using o-xylene (o-X) as the solvent and PCBM solution in chlorobenzene (CB) as the additive, which can simultaneously inhibit the aggregation of C 60 and advocate fast solvent drying. Homogeneous C 60 films of high quality from the new recipe solution can be readily fabricated at room temperatures, advocating the efficiency of the printed PSCs to over 17%. Finally, a champion efficiency of over 20% for the PSCs was achieved which is comparable to that of the PSCs with PCBM as the ETLs. XP-C 60 based PSCs also show good stability, which sustain 85% of its initial efficiency as being exposed in air with a relative humidity (RH) of 50% for over 20 days. Our work helps to understand the film-formation dynamics of C 60 by a solution method and cut the production cost of the PSCs to the bone.
As an important classification of photodetectors, broad spectral photodiodes are ubiquitous in the fields of industry and scientific research. Here, we reported a type of broad spectral organic–inorganic hybrid photodiodes (OIHPDs) based on planar-bulk heterojunction, which composed of 3,4,9,10-perylenetertracarboxylic dianhydride (PTCDA), copper phthalocyanine (CuPc) and fullerene (C 60 ). In our research, the dark current of the OIHPD with 10 nm C 60 film (10 nm-C 60 OIHPD) was as low as 25.6 μA, which is about 63 times smaller than the dark current of the OIHPD without C 60 film (C 60 -free OIHPD). It is considered that the significantly enhanced performance of 10 nm-C 60 OIHPD is attributed to the introduction of the C 60 film, which act as hole-blocking layer to reduce the dark current. And through the schematic energy level model combined with experimental measurements, the reason for the dark current change was well explained. Furthermore, the specific detectivity of 10 nm-C 60 OIHPD was almost one order of magnitude larger than it of C 60 -free OIHPD, and a notable enhancement of over 10 11 cm Hz 1/2 /W was obtained due to the fiercely reduced dark current. These results provide insights on how to improve the performance of organic photodiodes.
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