Omnidirectional and Broadband Light Absorption Enhancement in 2-D Photonic-Structured Organic Solar Cells

Abstract

The effect of 2-D photonic-structures on omnidirectional and broadband light absorption enhancement in organic solar cells (OSCs) is analysed using a combination of theoretical simulation and experimental optimization. The photonic structures in the active layer, with a blend system of poly[4,8-bis[(2-ethylhexyl)oxy] benzo[1,2-b:4,5-bA] dithiophene-2, 6-diyl][3-fluoro-2-[(2-ethylhexyl) carbonyl]thieno[3,4-b]-thiophenediyl] :[6,6]-phenyl-C70butyric-acid-methyl-ester (PTB7:PC70BM), were prepared by the nanoimprint method. It shows that the 2-D photonic structures enable not only broadband but also omnidirectional absorption enhancements in the PTB7:PC70BM-based OSCs over a broader angle range of the incident light, leading to >11 % increase in the power conversion efficiency, as compared to an optimal planar control cell. A weak angular dependency on light absorption is a unique feature of the photonic-structured OSCs, which is useful for different applications.

A sodium citrate-modified-PEDOT:PSS hole transporting layer for performance enhancement in inverted planar perovskite solar cells

“…The results confirm that the inverted planar PSCs with a Na 3 C 6 H 5 O 7 -modified PEDOT:PSS HTL are more effective to suppress the interfacial charge recombination at the HTL/MAPbI 3 interface, resulting in an efficient charge collection probability. Our results agree with the previous study in showing that charge recombination rate plays a critical role in defining the V OC value 23 . Hence, the reduction in charge recombination in the PSCs with a Na 3 C 6 H 5 O 7 -modified PEDOT:PSS HTL enables a higher V OC than that in a control inverted planar PSC with a pristine PEDOT:PSS HTL.…”

Over 20% Efficient and Stable Non‐Fullerene‐Based Ternary Bulk‐Heterojunction Organic Solar Cell with WS2 Hole‐Transport Layer and Graded Refractive Index Antireflection Coating

“…As stated in the introduction, the moth‐eye shaped nanostructures have been previously applied in inverted binary blend BHJ‐OSCs. [ 23 ] According to Lan et al., an inverted binary blend OSC [ 23b ] of the structure glass/ITO/ZnO/PTB7:PC 70 BM/MoO 3 /Ag in which the active layer of the blend PTB7:PC 70 BM is made into 2D moth‐eye shaped nanostructures [23a] with the moth‐eye shaped nanostructure patterns of height 51 nm, enhances the photon absorption and short circuit current density, resulting in a PCE enhancement of 6.1% in comparison with the planar structure. Another paper by Lan et al.…”

“…Another paper by Lan et al. [ 23b ] of the similar binary blend BHJ‐OSC structure, with the active layer having moth‐eye shaped nanostructure patterns of height of 30 nm, has reported that the overall PCE gets enhanced by 11%. The above two works have focused on introducing the moth‐eye shaped nanostructures within the active layer of inverted binary OSCs.…”

“…The graded refractive index coating is achieved through biomimetic moth‐eyes nanostructures [ 21 ] on the top of glass substrate which forms a gradual variation of refractive index region between the air and the glass substrate and thereby reduces the reflection loss from glass substrate. [ 20a,22 ] The moth‐eye shaped nanostructures have already been applied within the active layer of binary blend of BHJ‐OSCs of inverted [ 23 ] structures leading to an enhancement in PCE by 6.1% [ 23a ] and 11% [ 23b ] .…”

NIR to Visible Light Upconversion Devices Comprising an NIR Charge Generation Layer and a Perovskite Emitter

“…The mixtures were then dissolved in 1,2‐dichlorobenzene (Sigma‐Aldrich) at a concentration of 6 mg mL −1 . The polymer/acceptor solutions were kept at 60 °C and stirred for 24 h. ZnO precursor solution was prepared with different concentrations of 0.05 and 0.5 m . The ZnO precursor solutions were stirred overnight before use.…”