Session Index

An advanced structure composite of poly-Si/ tunnel SiO2 as passivation contact has been developed and realized for solar cell applications. The passivation result with implied open circuit voltage (iVOC) of 726 mV and carrier lifetime of 5004 μs were examined. By applying this passivation structure to c-Si photovoltaics, Tunnel Oxide Passivated Contact (TOPCon) solar cells were developed and revealed a promising result with efficiency >23%. The module made by these TOPCon solar cells with high performance of 20.7% efficiency and 352W power was obtained.

 

Here, we have fabricated an efficient organic photovoltaic device with novel small- molecular donor/ acceptor on an ITO-free electrode. The ITO-free device shows its potential to replace the conventional ITO-based electrode

 

The nanoparticle-based TiO2 electron transport layer of n-i-p perovskite solar cells is treated with the non-vacuum dielectric barrier discharge jet using He as the carrier gas. The photoelectrical conversion efficiency is enhanced from 13.92% to 14.43% for the on-glass cell and from 12.30% to 13.66% for the on-PEN cell.

 

This study has numerically evaluated the performance of Si-based ultra-thin solar cell can be enhanced by cascading a dilute-nitride Ga(N)AsP. The result shows, in case of thickness = 11.5 micron, the efficiency can be improved from 12.7% to 18.9%. In case of efficiency = 13.1%, we can significantly reduce thickness from 15 micron to 5.5 micron.

 

Bimetallic Au-Cu alloy nanoparticles (NPs) are incorporated in the anodic buffer layer to enhance the performance of organic photovoltaic devices (OPVs). Localized surface plasmon resonance (LSPR) induced by the NPs effectively increase the power conversion efficiency (PCE) both under 1 sun illumination condition and indoor light sources (LED and TL5).

 

The development of renewable energy is a trend in the world. And developing thin-film solar cells, which utilize photovoltaic effect to convert light energy into electrical energy, will play a key role in the global trend. Chalcogenide based thin-film photovoltaics such as CdTe and Cu(In,Ga)Se2 (CIGSe) have achieved remarkable over 20% power conversion efficiency (PCE). These thin-film materials have wide spectral response ranges and high absorption coefficients, so they are sensitive to weak light. However, the toxicity of cadmium (Cd), and the scarcity of indium (In) and tellurium (Te) may restrict the production capacity for a growing worldwide power consumption (~terawatt). Therefore, the development of low-cost, earth-abundant thin-film solar cells have attracted a lot of attention. the new generation metal chalcogenides: Cu2ZnSn(Se,S)4 (CZTSSe) and Cu2BaSn(S,Se)4 (CBTS) will be two of the most potential alternative photovoltaic energy materials due to its abundant, non-toxic elements and providing desirable optoelectronic properties, similar to CIGSSe. In this talk, I will share some of our recent progresses on CZTSSe and CBTS:

(1) Interface engineering of CdS/CZTS(Se) is an important aspect of improving the performance of buffer/absorber heterojunction combination. It has been demonstrated that the crossover phenomenon due to the interface recombination can be drastically eliminated by interface modification. Here, we present a comprehensive study on the effects of soft-baking (SB) temperature on the junction properties and the corresponding optoelectronic and interface-structural properties;

(2) we used vacuum process to synthesis the CBTSSe absorber and performed Raman, X-ray diffraction (XRD), photoluminescence (PL) measurements as the tools to understand the quality and the information of phase identification. Based on the results, the two-step prepared CBTSSe absorbers with tunable bandgap has been successfully demonstrated.

 

In this work, perovskite solar cells using isobutyl alcohol (IBA)-doped PEDOT:PSS hole transportation layer (HTL) were fabricated. Using IBA doping could improve the conductivity of PEDOT:PSS HTL and match the highest occupied molecular orbital (HOMO) energy level between PEDOT:PSS and perovskite, which could improve the performance of perovskite solar cells.

 

In this study, the gold nanoparticles (AuNPs) solutions with different absorbance peaks are mixed with TiO2 powder to prepare photoanode using doctor blade method. The optimal photoelectric conversion efficiency (PCE) of dye-sensitized solar cell (DSSCs) for Au-TiO2 photoanode with absorbance peak of 0.2 a.u. is 4.69 %.

 

Schottky photodetector based on Nickel (Ni/n-Si) is characterized for low cost and simple process. We found that it could generate current by internal-light excitation mechanism and rapid photocurrent when the hot carriers cross the Schottky barrier at the same time. Our research investigated the relationship between the two effect completely.

 

The different ZnO synthesis will influence the device performance of polymer solar cells (PSCs). Regarding the previous work, ZnO is a critical thing to determine the behavior of carrier-transporting in the active layer. Thus, this paper provides a suitable method of ZnO synthesis to enhance the performance in PSCs.

 

N-type hydrogenated amorphous (n-a-Si:H) and microcrystalline silicon (n-μc-Si:H) were fabricated by plasma-enhanced chemical vapor deposition (PECVD). The influence of n-a-Si:H and n-μc-Si:H films on the performance of single n-layer and double n-layers p-i-n solar cells were investigated.

 

Hydrogenated amorphous silicon thin films with different silicon-hydrogen bonds of a-Si:Hx/a-Si:Hy multilayer structures and TCO/p/i(a-Si:Hx/a-Si:Hy)/n/Al p-i-n were fabricated by periodical modulation of RF power of plasma enhanced chemical vapor deposition (PECVD). Optimization of this thickness ratio can improve the I-V characteristics of the a-Si:Hx/a-Si:Hy multilayer p-i-n solar cells.

 

A thin aluminum film on the inverted-pyramid-like surface of a silicon wafer was transformed into an aluminum oxide layer by the method of ozonation. Lifetimes of the wafers with such passivation layers proved to be increased, and the resultant PERC cells showed performance improvement compared with conventional counterparts.

 

Perovskite layer is formed using by two-step sandwich evaporation technique (SET). First, we spin coating MAI and combine PbI2 by thermal evaporation. Second, we evaporate MAI at low-pressure to make better morphology of perovskite crystallize. Through the double-interdiffusion using SET, one can enhance the perovskite solar cells to high PCE=14.6%.

 

A bifacial perovskite solar cells with an active area of 1.02 cm2 deliver a remarkable efficiency of 14.66% after optimizing the transmittance and sheet resistance of IZO, and the finger Au spacing. Eventually, a promising PCE of 20.92% for four-terminal perovskite/silicon tandem cell with 1.02 cm2 active area is demonstrated.

 

The plasmonic effects of the silver nanoparticles embedded in TiO2 antireflective layer on the front-side surface and up-conversion of YF3:Yb3+/Er3+-doped phosphors layer on the back-side surface of silicon solar cells to enhance cell’s efficiency, of 23.68% and 1.39%, respectively, are experimentally demonstrated in this study.

 

The silicon-based photodetector is limited by the 1.1 eV energy gap and the cut-off wavelength is about 1.2 μm. In this work, Schottky barrier formed by nickel silicide can effectively extend the cut-off wavelength. Furthermore, the annealing process improves the infrared light signal-noise-ratio (SNR) of the photodetector.

 

In this study, perovskite solar cells based on three different solvents of PbI2 (DMF, DMSO, and DMF/DMSO with a volume ratio of 7:3) are fabricated by using two-step method. With the improvements of surface morphology and crystallinity of perovskite layer, a decent photoelectric conversion efficiency of 6.02 % is achieved.

 

CsPbIBr2 is considered as an ideal candidate with proper bandgap. Nevertheless, the working stability hinders its further application. The instability due to ion migration is inhibited by introducing large size cation as shown by PL This approach also leads to improved stability against moisture and light.

 

This work utilizes a thin Cu-Ag alloy as the electrode of a semitransparent organic solar cell. The PCE of the semitransparent device is 1.26% with EQE more than 20% in the infrared spectrum. The semitransparent shows favorable AVT exceeding 77%, which is beneficial for see-through applications.

 

We have investigated on the influence of the electron transport layer on the injection voltage of perovskite light-emitting diodes . Now we change the film thickness of the capping layer PC61BM to see how it changes the injection voltage.

 

We propose a simple approach to construct flexible rGO photodetectors on paper substrates. The photodetector shows an on off ratio of 1.25 and a responsivity of 18.73 mA/W under 532 nm laser illumination. Our results provide a strategy for fabricating rGO-based photodetectors which show a potential for wearable systems applications.

 

We reported a simple evaporation process to deposited a lead iodide (PbI2) film followed with a methylammonium iodide (MAI) solution dip coating to prepare a MAPbI3 perovskite. Consequently, the as-fabricated MAPbI3 perovskite solar cell yielded a power conversion efficiency (PCE) of 8.7%.

 

We have investigated on the improvement of efficiency of perovskite solar cells (PSCs) with different perovskite precursor solution. Finally, the optimized device with the DMF:DMSO with a v/v of 4:1 exhibits high power conversion efficiency(PCE) and high external quantum efficiency (EQE).

 

Perovskite single crystals ideally exhibit better optoelectronic properties than polycrystalline thin films because they possess lower defect densities. Herein, we find that dripping TOPO on the surfaces of perovksite single crystals improve their photovoltaic performance. The power conversion efficiency is averagely improved from 11.9% to 14.76% after the surface passivation.

 

In the study, with wavelength of 365, 405 and 435 nm LED light illumination is the evaluated by photocurrent-voltage (PC-V) measurements at different aperture size, LED light power and duty of cycle square waves of ac signal in In-Ga-Zn oxide (IGZO) Light-addressable potentiometric sensor (LAPS).

 

Carrier induced hydrogenation (CIH) is one solution for light induced degradation. The mechanism of CIH process is the passivation of B-O related defects by hydrogen atoms. Here, we investigated the effect on the enhanced conversion efficiency by the amount of hydrogen effused from the rear SiNx:H layers.

 

In this conference, we present a heterojunction photodetector based on a hybrid copper oxide nanoclusters (Cu2O/CuO NCs)/zinc oxide nanorods (ZnO NRs) structure. Copper oxide NCs and ZnO NRs are respectively deposited on an indium tin oxide (ITO)-coated glass by hydrothermal method and pulsed-laser deposition (PLD).

 

We developed method to grow quasi-two-dimensional perovskite single crystals.The single crystal is directly grown on hole transport layer,VB-FNPD,and we control thickness of single crystal to 10μm.Adjusting ratio of ions in the precursor solution,we can obtain thin-film crystals with vertically oriented 2D stacked structure.The highest conversion efficiency achieve up to 15.50%.

 

Formamide iodide (FoAI) was synthesized and applied as an additive for FAPbI3 based perovskite solar cells (PSCs). FoAI additive improved the performance of PSCs by inhibiting formation of δ-FAPbI3 which deteriorates the performance of PSCs. We believe FoAI is a promising additive to boost the performance of PSCs.

 

The purpose of this study is to enhance the perovskite stability by 2D/3D stacked perovskite layer. We incorporated SCN- anion into FA0.9Cs0.1PbI3, further deposited large-size on SCN-based perovskite to improve the stability of the perovskite solar cells.

 

We spin-coat a layer of methylammonium chloride (MACl) on the perovskite active layer in order to improve efficiency for indoor applications. These surface treatments can not only increase the bandgaps and the open-circuit voltages but also improve PCEs from26.4% to 30.5% at 1000 lux under indoor lighting conditions.

 

In this conference, we present a photocathode based on a hybrid copper oxide (Cu2O)/zinc oxide nanorods (ZnO NRs) heterojunction structure. Copper oxide and ZnO NRs are respectively deposited on an indium tin oxide (ITO)-coated glass by chemical bath deposition and hydrothermal method.

 

In this study, the chemical solution method was used to prepare one-dimensional ZnO nanorod photoelectrodes, which were subsequently used in dye-sensitized solar cells (DSSCs). The effects of ZnO nanorods (NRs) on the dye adsorption performance of DSSCs were investigated by growing ZnO NRs with varying lengths as photoelectrodes.

 

Solution process and sandwich evaporate technique (SET) are used to fabricate MAPbI3 perovskite solar cells doped with chloride ion, respectively. MAPbIxCl3-x solar cells fabricated by SET and solution process both perform well. We have successfully produced chlorine containing perovskite solar cell with a high crystallinity and high efficiency of 15.1%.

 

Integrating an efficient perovskite photodiode with high-purity color filters, we achieved PVSK color PDs with LDRs over mesopic vision and demonstrated highly color recognition beyond human eye. We also designed a surface phase-matched transmission enhancement top electrode−Ag/indium tin oxide (ITO) structure for highly efficient and aesthetic semitransparent organic photovoltaics.

 

Use DMSO to process the PEDOT:PSS interface to improve conductivity, and add a MAI buffer layer to avoid the metal Pb generated by the contact between PSS and PbI2. Through the improvement of the interface, the efficiency conversion efficiency is increased from 3.8% to 12.7%.