Silicon/Organic Hybrid Solar Cells with 16.2% Efficiency and Improved Stability by Formation of Conformal Heterojunction Coating and Moisture‐Resistant Capping Layer

Abstract

Silicon/poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) heterojunction solar cells with 16.2% efficiency and excellent stability are fabricated on pyramid-textured silicon substrates by applying a water-insoluble ester as capping layer. This shows that a conformal coating of PEDOT:PSS on textured silicon can greatly improve the junction quality with the main stability failure routes related to the moisture-induced poly(3,4-ethylenedioxythiophene) aggregations and the tunneling silicon oxide autothickening.

Tantalum Nitride Electron‐Selective Contact for Crystalline Silicon Solar Cells

“…[28][29][30][31][32] Metal-oxide, fluoride, and polymerbased DF-CSCs are easy to deposit at an acceptable cost (e.g., thermal evaporation, spin coating, or atomic layer deposition, ALD); however, most of them suffer from a poor stability, either chemically or thermally, [11,16,18,23,24,33] which limits their industrial applications. When the metal is in direct contact with the silicon surfaces, very large densities of electronic states at the interface can be introduced into 8-hydroxyquinolinolato-lithium (Liq), perylene diimide, have also been developed.…”

TiO2 Films from the Low‐Temperature Oxidation of Ti as Passivating‐Contact Layers for Si Heterojunction Solar Cells

“…These issues have motivated studies to search for alternative new functional materials and simplified deposition technologies, whereby we can directly form high quality of heterojunctions with c‐Si substrates in a dopant‐free manner. During the past 5 years, dopant‐free HSCs with hole‐selective transport materials (e.g., molybdenum oxide (MoO x ), tungsten oxide (WO x ), vanadium oxide (V 2 O x ), and poly(3,4‐ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS)) and electron‐selective transport materials (e.g., titanium dioxide (TiO 2 ), magnesium oxide (MgO x ), and magnesium fluoride (MgF x )) have already been implemented on c‐Si absorbers and promising progress has been achieved.…”

Highly Conductive and Wettable PEDOT:PSS for Simple and Efficient Organic/c‐Si Planar Heterojunction Solar Cells

“…Recently, it has been reported that the conductivity of PEDOT:PSS films can be increased about three orders of magnitude by addition of solvents, such as dimethyl sulfoxide (DMSO), ethylene glycol, or 2‐methylimidazole . Meanwhile, recent studies have also revealed that the improved uniformity of the PEDOT:PSS film deposited on the Si substrate has been enabled by adding surfactants (FS300 and Triton X‐100) in PEDOT:PSS solution, both of which have resulted in the improved device performance of organic/n‐Si planar heterojunction solar cells. Although numerous works have confirmed modifying the PEDOT:PSS film capable of enhancing the efficiency for PEDOT:PSS/n‐Si heterojunction solar cells, it is not clear what the dominant origin for the improvement of conductivity of PEDPT:PSS film is .…”

“…Although numerous works have confirmed modifying the PEDOT:PSS film capable of enhancing the efficiency for PEDOT:PSS/n‐Si heterojunction solar cells, it is not clear what the dominant origin for the improvement of conductivity of PEDPT:PSS film is . The working mechanism of the heterojunction and the relationship between the material properties of the PEDOT:PSS layer and the device performances are poorly understood, and it is not clear what the dominant origin for enhanced device performance based on the PEDOT:PSS interlayer is . The J SC and FF of PEDOT:PSS/n‐Si heterojunction solar cell are lower when compared with the conventional homogeneous p–n Si junction solar cell .…”