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Different agglomeration properties of PC <sub/>61</sub> BM and PC <sub/>71</sub> BM in photovoltaic inks a?? a spin-echo SANS study
摘要： Fullerene derivatives are used in a wide range of applications including as electron acceptors in solution-processable organic photovoltaics. We report agglomeration of fullerene derivatives in optically opaque solutions of PC61BM and PC71BM, with concentrations ranging from 30 mg mL?1 up to 90 mg mL?1, in different solvents with relevance to organic photovoltaics, using a novel neutron scattering technique, Spin-Echo Small Angle Neutron Scattering (SESANS). From SESANS, agglomerates with correlation lengths larger than 1 mm are found in some PC61BM solutions, in contrast no agglomerates are seen in PC71BM solutions. These results clearly show that PC71BM is fundamentally more soluble than PC61BM in the solvents commonly used in photovoltaic inks and corroborating similar observations previously achieved using other experimental techniques. Computer models are presented to study the energetics of solution and agglomeration of both species, ascribing the difference to a kinetic effect probably related to the larger anisotropy of PC71BM. Also, this work showcases the power of SESANS to probe agglomerates of fullerene derivatives in completely opaque solutions for agglomerates of the order of one to several microns.
关键词： Fullerene derivatives,SESANS,PC61BM,agglomeration,organic photovoltaics,PC71BM
更新于2025-09-23 15:21:01
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Enhanced effect of 1,2-dichlorobenzene on the property of PC61BM and perovskite films for planar heterojunction perovskite solar cells
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.
关键词： PC61BM,chlorobenzene,perovskite solar cells,1,2-dichlorobenzene
更新于2025-09-12 10:27:22
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Charge Transport and Extraction of Bilayer Interdiffusion Heterojunction Organic Solar Cells
摘要： Bilayer interdiffusion heterojunction with the structure of donor-rich region near the anode and acceptor-rich region near the cathode, could weaken energy level barrier between active layer and electrode, and improve the performance of organic solar cells. In this study, the poly (3-hexylthiophene) (P3HT) / [6:6]-phenyl-C61-butyric acid (PC61BM) bilayer interdiffusion heterojunction organic solar cells were prepared by using orthogonal solvent method, and the charge transport and extraction characteristics were investigated detailedly. The transient photovoltage/transient photocurrent measurements showed that the bilayer interdiffusion heterojunction devices have longer carrier recombination lifetime and shorter charge extract time, and higher carrier mobility of bilayer interdiffusion device was verified by photo-induced charge carrier extraction by linearly increasing voltage technology. The results indicated that the improved heterojunction structure of bilayer interdiffusion devices could reduce carrier recombination and improve charge transport and extraction efficiency. The performance of bilayer interdiffusion device was enhanced obviously, and about 19.8 % power conversion efficiency improvement was achieved as compared with the bulk device. Bilayer interdiffusion heterojunction provide an efficient device structure to optimize performance of organic solar cells.
关键词： Bilayer interdiffusion heterojunction,PC61BM,organic solar cells,P3HT,charge extraction,charge transport
更新于2025-09-11 14:15:04