Tech4Win aims to develop a highly innovative transparent photovoltaic (PV) window based on the combination of an inorganic UV selective multifunctional coating (UV filter + UV selective solar) that is deposited on the first laminated glass of the window, and an organic IR selective solar cell that is implemented at the gap spacer of the window. This “tandem inspired structure cell” will be able to generate on-site renewable energy (PCE ≥ 10%, with a long term goal of ≥ 12%), guaranteeing a high-transparency degree (average visible transparency AVT ≥ 60%, with a long term goal ≥ 70%), achieving a lifetime ≥ 10 years (long term goal ≥ 25 years) and all by a competitive manufacturing costs estimated in 160-200€/m2. The proposed solution will avoid the use of critical raw materials (CRM) ensuring the absence of potential problems for the future supply of the raw materials and allowing for a sustainable transfer to mass production levels. In addition, the devices will be designed through the integration of light management concepts (based on Distributed Bragg Reflectors (DBR)) to reach the challenging targets defined in terms of conversion efficiency and transparency.

Tech4Win roadmap

The following chart summarizes the main expected outputs associated to each key stage of the technology development process along the years from the “proof of concept” to the “mass market penetration.

Objectives and targets

Tech4Win proposes the development of CRM-free hybrid UV and IR selective PV cell prototypes which can be integrated within a wide portfolio of smart windows and capable to meet the requirements and standards demanded by the construction sector. The main objective of this project is to develop a set of transparent PV window prototypes (S and M sizes) with strong improvements in the level of transparency and visual quality in the visible region, energy generation, advanced filtering capacities, thermal behaviour and energy impact. They will be exhaustively tested in a relevant environment for demonstrating their feasibility as a smart window. The key concept is based on the capacity to exploit the IR efficiency potential of organic based solutions with the robustness and stability of inorganic thin film concepts combining sustainable and industrial compatible technologies with demonstrated potential for cost reduction and sustainable mass deployment.

Main quantitative objectives of the project are related to the following Key Performance Indicators (KPIs):

In terms of transparency, the project proposes a target at the end of the project of AVT ≥ 60% that is suitable for main BIPV applications, taking into account that higher AVT values can determine problems in terms of inner comfort specially in office buildings. The long term target of AVT ≥ 70% will allow widening the range of specifications of the products, addressing also cases where higher levels of transparency are required as those from automotive and Electronic smart window sectors.



To achieve Tech4Win main goal, as well as it specific objectives, the work plan is structured in 8 Work Packages (WPs) which include five different kinds of WP:

WP1 is devoted to the definition of the technical, functional and aesthetic requirements of the solar windows, determining the specific requirements and product specifications according to the sector needs.

-WP2, WP3 and WP4 constitute the main technological core of the project and include the development and optimisation of the IR and UV selective devices. Development and technological implementation of the IR selective devices in WP2 and of the UV multifunctional coatings in WP3 will be performed in strong interaction with the optimisation of the design of the devices architectures that will be based on their multifunctional modelling in WP4.

-WP5 deals with the upscaling of the processes and their integration for the manufacturing and demonstration of window prototypes complying with acceptability tests.

-WP6 is centered on the assessment of the industrial transferability of all the components of the final system that will be addressed following a Circular Economy Strategy, identifying the means and risks for the industrial implementation of the processes developed in the project and defining a detailed a technology roadmap to upscale the results until TRL-9.

-Cross-cutting WPs include WP7, which addresses the dissemination and exploitation activities that will be defined in the PDER, including tasks related with knowledge transfer, standardization aspects and IPR, and WP8, which is dedicated to the project management.
The work programme of Tech4Win is conceived from a circular economy point of view, with emphasis in the scientific and technological related aspects for the development of disruptive device concepts for the demonstration of a new generation of transparent solar windows with improved performance.

The project takes also special care of aspects dealing with the demonstration of the viability, competitiveness and durability of the processes and products under development, answering the needs of the BIPV market for new robust, high performance and competitive window solutions as is shown in the next Figure.

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