Rezultaty
Quantitative loss analysis (parasitic absorption, resistive losses, and optical reflection) relying on the results from advanced characterization methods, including photoelectron yield spectroscopy, will address interface defects (with sensitivity better than 1 defect per 1000 atoms) and resulting recombination losses at the cSi interfaces, limiting the achievable Voc and efficiency.
Fabrication and delivery of 2500 high quality n-type Cz wafer per yearA total of 5000 high-quality c-Si wafers will be fabricated in two batches of 2500 (within M12 and within M24). Lifetime over resistivity ratio and resistivity will be constantly monitored to be higher than 2 ms/Ohm.cm and in the range between 1 – 2 ohm.cm, respectively.
Reports on optical characterization of comb finger shapes with guidelines for use by other WPsThe work aims to provide non-contact tool for optimization of the IBC scheme. Its sensitivity (estimated at thickness resolution to below 1 nm) and spatial resolution limits (below 500 nm) will be assessed on both smooth and rough test samples for a-Si:H as well as novel mate-rials for contact stacks (doped mc-Si:H and mc-SiOx:H, TMOs).
Textured c-Si exhibiting low reflectance (<5%) and implied current density beyond 41.5 mA/cm2Textured c-Si wafers enable the optimal absorption of light inside the solar cell. Single and double-side pyramidal texturing and single sided modulated surface texturing will be tested. Reflectance spectrum and implied current density will be measured, seeking for benchmark values, such as <5% and 41.5 mA/cm2, respectively.
Report on the rear design of high efficiency IBC-SHJ solar cellsReport on the rear design of high efficiency IBC-SHJ solar cells, including novel contact stacks, their patterning on both structured and flattened back side, reflector structures and other innovative approaches used in the NextBase will be simulated in 1D – 3D simulations in AFORS-HET, ASA, Quokka and Sentau-rus tools.
Report on the energy yield of IBC-SHJ-based PV modules in both mono-and bi-facial configurationsReport on the yearly energy yield estima-tion of IBC-SHJ-based full-size PV modules in both mono-and bi-facial configurations incorporating optical model from T8.3 and module materials defined by WP7 as well as EU climate input.
Report on a pathway to reach the efficiencies defined in the project goals, and beyondThe NextBase targets world-record efficiencies > 26% at cell level and > 22% at module level. This report will summarize lessons learned during the above described WP8 studies as guidance for the final period of the project effort.
Report presenting the results on D2.1. This document is related to task T2.1.
Newsletter for project new developments and results after each yearReport presenting the results on D2.6. This document is related to task T2.2.
Production of IBC SHJ precursors and cells.
IBC-SHJ device with efficiency ≥ 26.0% on 6-in waferThis milestone aims at processing an IBC-SHJ device on a 6-in wafer, with an efficiency ≥ 26.0%, using the best processes and materials developed in WP4 and WP5. The achievement of this milestone will be certified by sending one or more devices to a certification laboratory for a calibrated I-V measurement (e.g. Fraunhofer ISE CalLab).
IBC devices with TMO based contact stacks with Voc>740 mV and FF>82%In this deliverable we aim at the demonstration of high-efficiency solar cells, employing novel TMO based contact stacks, which are developed in task T4.2. The fabricated devices will be characterized by 1-sun I-V measurements. The success or failure of this deliverable will be determined by the measured electrical parameters.
IBC devices employing a-Si:H and c-Si:H based contact stacks with Voc>740 mV and FF>82%The aim of this deliverable is the achievement of high-efficiency solar cell devices employing novel a-Si:H and uc-Si:H based contact stacks, which are developed in task T4.1. The devices will be characterized by 1-sun I-V measurements and the success, or failure, of this deliverable will be determined by the measured electrical parameters.
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