Metal Oxides: Maturing of an Efficient Novel Technology Upgrade for PV-Manufacturing (MOMENTUM)

Publieke samenvatting / Public summary

The main advantage of passivating contacts is their full-area surface passivation, which leads to high cell voltages. Transition metal oxide (TMO) based passivating contacts also feature high transparency and low-cost processing, making them uniquely suited for the front side. However, to exploit their full potential towards >25% efficient solar cells, more R&D is required on several aspects.

In MOMENTUM we will build upon previous achievements that clearly showed the high-efficiency potential and simple, short process flow of these passivating contacts. We will demonstrate a good performance of hole-selective and electron-selective TMO front contacts, made by pulsed laser deposition (PLD) and/or atomic layer deposition (ALD), in 6-inch solar cells.

Korte omschrijving
TU/e and ECN.TNO will perform dedicated research for improvement and control of the properties of ALD TiOx and PLD MoOx based passivating contacts, also with oxide interlayers. Solmates will play an important role in placement and process support in the solar PLD cluster tool at ECN.TNO, which will be used for development of low-damage MoOx, layers, for the hole-selective contact, and transparent conductive oxides (TCOs). Levitech will support in optimization of the Levitrack process for deposition of Al2O3 as a passivating interlayer in selective contacts and evaluate implementation of the novel ALD processes developed by TU/e, like an ALD buffer layer that enables the use of TCO on TiOx. TUD will provide reference lab processes on a-Si:H interlayers and work on alternative oxide interlayers. Since all the relevant industrial equipment is available at the ECN.TNO site in Petten, we expect to speed up the development of TMO-based contacts, thus maintaining the ‘momentum’ from previous projects.

The MOMENTUM project will result in a demonstration of highly selective and passivating TMO-based transparent passivating contacts at the front side of 6-inch bifacial solar cells. Some key bottlenecks for this technology will be solved, enabling their potential for further development towards an industrial process for >25% industrial solar cells consisting of a minimal number of (front side) processing steps.