Session Index

Conventional photovoltaic devices, such as crystalline Si cells, exhibit poor efficiency under indoor or low level outdoor lighting. Many applications, however, require efficient, low cost light harvesting ability under dim-light conditions, e.g. wireless sensor nodes in home security and automation etc.

 

We demonstrate monolithic integration of high-voltage photovoltaic array and Schottky bypass diodes on the same bulk CMOS chip for the first time by post localized substrate removal and flip-chip bonding processes. Assembled PV module provides an output voltage of 4.19V and is less sensitive to the optical shading.

 

In this work, we demonstrate the Luminescent Down Shifting (LDS) effect of the single-junction GaAs solar cell with 514 nm Perovskite quantum dots with and without bake treatment. One of results shows that Jsc from 22.22 mA/cm2 to 23.38 mA/cm2 and the efficiency from 17.70% to 18.96%.

 

We investigate various organic materials including conductive polymer PEDOT:PSS, fluorescent polymers PFO and Green B, and small molecules DMFL-NPB, to serve as the hole selective contact. The results have shown that PEDOT: PSS could effectively passivate the silicon surface to increases Voc by 31 mV and the efficiency by 2.2%.

 

The n-a-Si:H and n-μc-Si:H films with different Eg, Ea and σd were fabricated by modulated hydrogen dilution, and RPH3 (PH3/SiH4) by PECVD. The influence of structural, optical and electrical properties of n-a-Si:H and n-μc-Si:H films on the current-voltage characteristics of HIT solar cells were investigated.

 

Solution-processed flexible regular perovskite solar cells with spray-coated silver nanowires as top electrodes were developed. The optimal cell achieves a Voc of 1.031 V, Jsc of 19.19 mA/cm2, FF of 54.4%, and PCE of 11.4%. The performance is close to that of the counterpart using an e-beam-evaporated Ag counter electrode.

 

The efficiency of CZTS solar cells is still not so high compared with other thin films such as CIGS. The underlying mechanism for the difference is a long-standing question that has remained elusive [1] in spite of tremendous research efforts in the past.

 

The production process of the PV module is simple but many details need to take care, any minor mistake can result in serious problem after installation. This presentation shows PV module failures in the field, and the related faults in the factory.

 

A theoretical framework and formulation is developed and presented for the energy transfer processes between photons, electrons, holes, optical phonons, and acoustic phonons in conventional and hot-carrier solar cells. This physical model includes the interband and intraband quantum processes of carrier-photon, carrier-carrier, carrier-phonon, and phonon-phonon interactions.

 

This presentation summarizes our recent works in perovskite thin films and devices. We developed all vacuum process for perovskite solar cells and various optoelectronic devices. We also developed a novel spray synthesis method for fabricating highly emissive perovskite nanocrystals for display and quantum optics applications.

 

Here, we have fabricated an highly efficient organic photovoltaic device with novel donor/acceptor molecules and a structurally modified anode layer to study its performance in-depth under sunlight and indoor light. The device not only demonstrates effective harvesting of indoor lights but also paves a path for fabricating an ITO-free OPV

 

Lightweight, plastic photovoltaic (PPV) devices are considered attractive renewable energy devices because they can be produced with high-throughput printing processes and they enable the usage of solar power on curved surfaces. Generally, the power conversion efficiency (PCE) of a PPV is lower than that of its rigid counterpart,

 

The hybrid electrodes constructed by the metal contact pads and SiO2/ITO/TiO2 triple layers were developed to reduce the shadow loss and the light reflection. The conversion efficiency of the resulted solar cells with hybrid electrodes was improved from 9.38% to 12.68% in comparison with the cells with traditional bus-bar electrodes.

 

We investigated the structural, optical and exitonic properties of MAxCs1-xPb(IxBr1-x)3 thin films. The time-dependent PL spectra shows that the MA0.8Cs0.2Pb(I0.8Br0.2)3 thin film is a photo-stable solar material, which is used to construct an efficient and stable perovskite solar cell without the additional encapsulation.

 

A method of fabricating large-size reduced graphene oxide (rGO) photodetectors by solution process has been proposed. The incorporation of rGO with CdSe quantum dots to form the active layer of photodetectors was further demonstrated to enhance the charge transfer, leading to the improved photoresponse of photodetectors.

 

In this study, we modeled the MAPbI3–based solar cell and found the optimized condition with textured structure and the efficiency has been improved to 20.8%. Besides, the hysteresis characteristics of PSCs caused by ion migration effect especially the iodide (I-) ion were also analyzed with different operation conditions.

 

We have changed the thickness of MoOx in MoOx/n-Si photodetectors. The suitable thickness of MoOx can result in a larger responsivity as compared to the control photodetectors without MoOx. Different excitation wavelengths show different relation between responsivities and thicknesses.

 

Potassium-doped nickel oxide (NiOx) compact layer was prepared via the sol-gel process to improve the conductivity and modify its work function. Inverted perovskite solar cells based on 3% K-doped NiOx as the HTL were fabricated and evaluated, achieving the best performance of 17.05% and long-term stability over 35 days storage.


 

P3HT and PC61BM were used as binary blends of active layers of organic solar cells,and p-type two-dimensional MoS2 quantum dots were added to improve the performance of the solar cells.Efficiency ternary hybrid solar cell incorporating p-type MoS2 QDs extensively higher than that solar cells based on binary mixture of P3HT:PC61BM.

 

Intrinsic hydrogenated amorphous silicon (a-Si:H) films with different bandgaps (Eg), imaginary part of dielectric constant (ε2), and microstructure parameter (Rs*) were fabricated by modulated process pressure, and hydrogen dilution ratio (R(H¬2/SiH4)) by PECVD. The influence of different intrinsic a-Si:H films on the performance of HIT solar cells were investigated.

 

We grow a quasi-two-dimensional (Q-2D) perovskite single crystal on the holetransport layer (VB-FNPD) by space-limited evaporation method improving the contact between the crystal and the hole transport layer to enable the quasi-two-dimensional single crystal device to achieve efficiency of 6%.

 

This paper aims to improve the characteristics of perovskite solar cells through the surface plasmonic effects triggered by copper nanoparticles.We positioned the CuNPs between the hole transport layer and the active perovskite layer. The energy conversion efficiency of the device can be improved from 11.69% to 13.73%.

 

An organic photodetector with low dark current density, which was achieved by inserting an efficient electron blocking material at the interface of ITO/organic interface. A comprehensive study on the proposed OPD is presented in this article including current-voltage characteristics, responsivity, specific detectivity, linear dynamic range and response speed.

 

The perovskite solar cells with ITO periodic array were fabricated. The ITO periodic array was utilized to reduce the reflectivity and increase the contact area between the hole transportation layer and the active layer. That could improve the carrier collection probability and the characteristic of the perovskite solar cells.

 

We demonstrate the benefits of combining an up-conversion (UC) with plasmonic scattering in enhancing the photovoltaic performance of textured-silicon solar-cells. Impressive results enhancing in short-circuit current density and conversion efficiency of 2.77% and 5.01% for cell with UC and of 5.55% and 8.04% for UC-cell with plasmonic-effects were obtained, respectively.

 

Metallic nanoparticles exhibit a localized surface plasmon resonance, which can be incorporated into perovskite solar cells to improve the power conversion efficiency (PCE). We have embedded Au nanoparticles into the CsPbBr3 quantum dots as the hole transport layer. The as-fabricated perovskite solar cell yielded a PCE as high as 10.9%.

 

A high-voltage solar cell module is demonstrated by leveraging in-foundry bulk CMOS process for chip fabrication and by conducting post localized substrate removal and wire bonding for voltage boosting. As-realized solar cell module provides an open-circuit voltage of 1.8V and an electrical power of 116 W under solar illumination.

 

The near-infrared-absorbing organic photovoltaics (PTB7-Th:IEICO-4F) were combined with phase-matched color-electrodes (Ag-ITO-Ag-ITO) to form transparent color solar cells, which obtained high-purity transmission light with high transmittance. Results give us a future perspective that solar windows are able to blend with the photosynthesis needs of crops to create a beautiful renewable-energy environment.

 

In this study, we highly doped PEAI to fabricate 2D/3D hybrid perovskite by low pressure vapor-assisted solution process (LP-VASP) and blade-coating process. We use the two-photon absorption technology and KPFM analysis the spatial distribution of different n value perovskite.

 

In this work, we doped TPFB in the hole transporting layer of our perovskite single crystal devices to enhance the efficiency. As the short-circuit current were increased by the addition of dopants, our perovskite single crystal devices had higher PCEs. The best PCE in our work can reach 15.67%.

 

The rapid growth of perovskite solar cells along with a PCE boosted above 25% have raised significant attentions. Future commercialization is now facing the issues of stability and toxicity. This investigation aims to provide experimental results of recently considered inorganic candidates for reaching comparable efficiency and decent stability

 

We present a new, simple and cost-effective etching method for the formation of inverted pyramids on single-crystalline diamond-wire sawn silicon wafers. We use acidic etching to produce nano-to-micro-structured caves followed by anisotropic etching with an alkaline solution.

 

In this study, the A LSC structure with geometry of rod should provide a good confinement of light and direct more light to the end of the rod. It is found that the open-circuit voltages of the samples increase as the phosphor increasing.

 

Pathway in chemical reactions needs to be considered under various forms of energy saving. Founded on the miller experiment and sonoluminescence mechanism, this article puts the use of illuminators as one of the design core for photo-chemical experiment setups. Novel design without the complicated circulation conducting element is proposed.