The Chinese Modulemaker said that the solar cell was developed with the support of the University of the Heei. The device uses a transport layer based on carbon nanobuis that can be used in topcon and HJT structures to stimulate the output and reduce complexity.
The Chinese Hebei University and module manufacturer Das Solar have jointly developed a silicon solar cell with a new hole transport layer (HTL) that has been designed to simplify production and lower the costs.
In this HTL, the researchers replaced the commonly used pedot with carbon nano bushes (CNT) combined with PSS. The resulting CNT: PSS composite functions effectively without heavy doping.
The new approach combines a high conductivity with excellent interface passivation. The work function of 5.63 EV exceeds that of conventional pedot: PSS (4.9–5.1 EV), which means that passivation with full area is possible, while passivating and conduction is integrated in a single layer.
To tackle CNT’s dispersion challenges in solution, the team used high pressure bone techniques and optimized carrier routes via interface engineering.
One of the most important benefits of the proposed cell architecture is its simplicity and cost -effectiveness. The CNT: PSS film can be coated on a solution at room temperature, which eliminates the need for doping or vacuum processes at high temperature. This reduces both thermal and equipment needs, resulting in considerable cost savings.
Prototype devices based on the CNT: PSS/SI design have achieved efficiency above 23.3%, which represents an improvement of 15% compared to pedot: PSS-based cells. Simulations suggest a theoretical efficiency ceiling of approximately 29%.
Details of the device are published in the newspaper ‘Efficient and stable gap transport material for solar cells: from pedot: pss to carbon nanobuis: pss“ in ACS Energy Letters.
Das Solar said that the CNT: PSS/SI HTL is promising over several fronts: it can be integrated as a hole transport/passiveness layer in topcon and HJT structures to stimulate exports and reduce complexity; It is very suitable to be a top electrode in perovskiet/silicon tandem stacks due to the high work function and processability with a low temperature; And the mechanical flexibility and more than 95 % optical transparency make it a potential choice for flexible and building -integrated photovoltaic applications (BIPV) applications.
Das Solar estimates that every Gigawatt production could save around CNY 25 million ($ 3.5 million), while production costs can fall by 25%by one cells.
This innovation stems from the DAS Solar – Hobe University Photovoltaic Innovation Research Center, founded in January 2024. As part of the collaboration, the University of the Heei has valued a Passeni improvement technology for liquid efficiency – appreciated on CNY 10 million – to Das Solar.
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