Device Architectures for Enhanced Photon Recycling in Thin-Film Multijunction Solar Cells
作者： Xing Sheng , Myoung Hee Yun , Chen Zhang , Ala'a M. Al-Okaily , Maria Masouraki
关键词:
摘要: Multijunction (MJ) solar cells have the potential to operate across entire spectrum, for ultrahigh efficiencies in light electricity conversion. Here an MJ cell architecture is presented that offers enhanced capabilities photon recycling and extraction, compared those of conventional devices. Ideally, each layer a should recycle re-emit its own luminescence achieve maximum possible voltage. This design involves materials with low refractive indices as interfaces between sub-cells structure. Experiments demonstrate thin-film GaAs devices printed on low-index substrates exhibit improved recycling, leading increased open-circuit voltages (V oc), consistent theoretical predictions. Additional systematic studies reveal important considerations thermal behavior these structures under highly concentrated illumination. Particularly when combined other optical elements such anti-reflective coatings, architectures represent aspects approach thermodynamic efficiency limits full spectrum operation.
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