Tunnelling recombination layer boosts effectivity of tandem photo voltaic cells
by Workers Writers
Ningbom China (SPX) Nov 16, 2023
Prof. YE Jichun’s crew from the Ningbo Institute of Supplies Know-how and Engineering (NIMTE) of the Chinese language Academy of Sciences (CAS), together with researchers from Soochow College, have developed a polycrystalline silicon tunnelling recombination layer for perovskite/tunnel oxide passivating contact (TOPCon) silicon tandem photo voltaic cells (TSCs), which has achieved wonderful effectivity and excessive stability.
On account of their theoretically ultra-high effectivity and price benefits, perovskite/silicon TSCs get pleasure from promising prospects within the photovoltaic trade and have attracted appreciable consideration. Earlier efforts to extend machine effectivity have primarily centered on bettering the highest sub-cell, leaving a lot room for enchancment.
The recombination layer, which serves as {the electrical} contact between the highest and backside sub-cells, performs a essential function in additional effectivity progress.
On this examine, the researchers developed a polycrystalline silicon (poly-Si) tunnelling recombination layer that was integrated right into a perovskite/TOPCon silicon tandem cell. Via a two-step annealing technique, the diffusion of boron and phosphorus dopants could possibly be successfully restrained, endowing the machine with wonderful passivation and call efficiency.
In contrast with the traditional clear conductive oxide layer, this novel tunnelling recombination layer displays stronger adsorption on poly-Si(p+) substrates and extra environment friendly charge-carrier transport and extraction for the higher perovskite sub-cells.
This newly developed tandem machine has achieved a exceptional photoelectric conversion effectivity of 29.2%, which is without doubt one of the highest values reported thus far for perovskite/TOPCon TSCs. As well as, the machine can retain 85% of its preliminary effectivity after 500 hours of steady most energy level monitoring, indicating excessive stability.
In accordance with the researchers, finite factor simulations offered additional perception into the provider transport and tunnelling mechanisms. Furthermore, related analyses revealed that the doping focus of poly-Si impacts the efficiency of perovskite/silicon TSCs.
This examine might make clear the additional growth and industrialization of high-efficiency perovskite/silicon TSCs and associated tandem units.
This work was supported by the Nationwide Key Analysis and Growth Program of China, the Ningbo “Innovation 2025” Main Mission, the Nationwide Pure Science Basis of China, and so on.
The examine was revealed in Nature Power.
Associated Hyperlinks
Ningbo Institute of Supplies Know-how and Engineering
All About Photo voltaic Power at SolarDaily.com
