Abstract
Abstract Due to stable and high power conversion efficiency (PCE), it is expected that silicon heterojunction (SHJ) solar cells will dominate the photovoltaic market. So far, the highest PCE of the SHJ-interdigitated back contact (IBC) solar cells has reached 26.7%, approximately approaching the theoretical Shockley–Queisser (SQ) limitation of 29.4%. To break through this limit, multijunction devices consisting of two or three stacked subcells have been developed, which can fully utilize the sunlight by absorbing different parts of the solar spectrum. This article provides a comprehensive overview of current research on SHJ-based tandem solar cells (SHJ-TSCs), including perovskite/SHJ TSCs and III–V/SHJ TSCs. Firstly, we give a brief introduction to the structures of SHJ-TSCs, followed by a discussion of fabrication processes. Afterwards, we focus on various materials and processes that have been explored to optimize the electrical and optical performance. Finally, we highlight the opportunities and challenges of SHJ-TSCs, as well as personal perspectives on the future development directions in this field.
Highlights
Crystalline silicon solar cells have dominated the photovoltaic market for decades
Due to stable and high power conversion efficiency (PCE), it is expected that silicon heterojunction (SHJ) solar cells will dominate the photovoltaic market
This work represents a key step toward controlled fabrication of efficient large area perovskite/SHJ TSCsusing the knowledge of nc-Si:H recombination layer
Summary
Crystalline silicon solar cells have dominated the photovoltaic market for decades. System components including installation, cabling, and inverters account for the main cost of photovoltaics, because these costs are areadependent. It uses an SHJ structure combined with an interdigitated back-contact (IBC) This efficiency is only 2.7% lower than the theoretical efficiency limit of 29.4% for silicon singlejunction solar cells [20]. A well-known strategy to overcome the Shockley– Queisser (SQ) theoretical efficiency limit is to employ multijunction architecture In these devices, a wide band gap top cell absorbs high-energy photons, and a narrow band gap bottom cell absorbs low-energy photons. A PCE of 35.9% was reported for a mechanically stacked four terminal GaInP/GaAs/Si tandem device [23] This is the highest PCE of silicon based TSCs. perovskite solar cell is another ideal candidate for SHJ-based tandem solar cells (SHG-TSCs) due to its tunable bandgap, easy fabrication, and high PCE of 25.5% [24]. The final section concludes with personal comments on the directions of future research on such new solar cells
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