Insertion of a TiOx layer between the Al electrode and the active layer of an organic photovoltaic cell resulted in a high performance with 94% durability under irradiation (100mW∕cm2) for 100h and had improved fill factor and open circuit voltage. An efficiency of 4.05% was achieved by using the cell containing a TiOx layer fabricated and measured in ambient atmosphere. The TiOx layer works as an effective barrier to physical damage and chemical degradation, resulting in high durability under aerobic conditions, and also serves as a hole blocking layer, resulting in improved parallel resistance and rectification.
Lead
chalcogenides colloidal quantum dot (PbS CQD) solar cells
employing an ordered bulk heterojunction (OBHJ) structure allow sufficient
utilization of solar energy and at the same time ensure efficient
charge extractions. However, the interfacial deficiency was determined
to be a significant limiting factor for the further improvement of
efficiency. Herein, a finely interpenetrating OBHJ structure between
zinc oxide nanowire (ZnO NW) arrays and PbS CQDs was achieved by simultaneously
controlling the growth orientation of ZnO NWs and introducing convective
assembly as the CQD deposition technique. The inherent directionality
during the assembly process leads to dense packing and efficient infiltration
of CQDs, forming a valid OBHJ structure. Additionally, a self-assembled
monolayer was introduced to further improve the V
oc deficit. As a result, a record PCE of 9.92% has been
demonstrated for OBHJ structured CQD solar cells that are compatible
with low-temperature and scalable manufacturing processes.
Composition dependence of the crystal structure between stibnite and antimonselite is investigated by using the single-crystal x-ray diffraction and the ab-initio calculation methods to clarify the Se substitution effect on the crystal structure, especially focusing on the stereochemical behavior of Sb
Sb2S3-based hybrid solar cells with electron transporting layer of TiO2 or ZnO nanoparticles in addition to poly(3-hexylthiophene)-2,5-diyl / (3, 4-ethylenedioxythiophene) : poly(styrene sulfonate), zinc phthalocyanine (ZnPc), or MoO3 for hole transporting layer were prepared and compared their photovoltaic properties with or without encapsulation by using glass and UV cut-off film. Among these hybrid solar cells, it was found that a combination of glass-ITO/TiO2/Sb2S3/ZnPC/Au encapsulated with glass and UV cut filter has the highest durability with keeping the relative power conversion efficiency of 90% through the stability test under 1 sun at 63 °C at a relative humidity of 50% for 1,500 h.
Organic-inorganic hybrid solar cells composed of glass/F-doped SnO2/TiO2/La-decorated or Zn-doped Sb2S3/ poly[(3hexylthiophene)-2,5-diyl]/poly [3-(3-carboxypropyl)thiophene-2,5diyl]/Au have been prepared and evaluated their photovoltaic performance. Using La-decorated Sb2S3 for hybrid solar cell resulted in 33% improvement of power conversion efficiency (PCE) as compared to that of the non-decorated Sb2S3 because of lowering the resistance at the interface, which was confirmed by the impedance analyses. It was found that the added La was phaseseparated and accumulated between the layers of TiO2 and Sb2S3. While doping of Zn into Sb2S3 resulted in the enlargement of the crystallite size of Sb2S3 from 14 nm to 25 nm. Utilization of Zndoped Sb2S3 for hybrid solar cell attained 57% enhancement of PCE. This result is ascribed to the effective lowering the bulkresistance.
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