单线态裂变光伏:进展和有希望的途径

IF 6.1 Q2 CHEMISTRY, PHYSICAL Chemical physics reviews Pub Date : 2022-02-02 DOI:10.1063/5.0080250
Alex J. Baldacchino, Miles I. Collins, M. Nielsen, T. Schmidt, D. McCamey, M. Tayebjee
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引用次数: 10

摘要

单重态裂变是多激子产生的一种形式,当一个高能单重态激子分离成两个低能三重态激子时,就会发生在有机发色团中,每个激子的能量约为单重态能量的一半。由于这一过程是允许自旋的,它可以在不到几皮秒的超快时间尺度上进行,胜过大多数其他损失机制,并达到接近200%的定量产率。由于这种高量子效率,单线态裂变过程有望成为减少光伏电池热化损失的一种手段。这将潜在地允许在单结电池中的效率提高超过热力学极限。在过去的十年里,将这一过程纳入太阳能光伏电池的努力已经跨越了广泛的器件结构。在这篇综述中,我们对这些尝试进行了比较和分类,以评估该领域的现状,并确定未来研究和开发的最有希望的途径。
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Singlet fission photovoltaics: Progress and promising pathways
Singlet fission is a form of multiple exciton generation, which occurs in organic chromophores when a high-energy singlet exciton separates into two lower energy triplet excitons, each with approximately half the singlet energy. Since this process is spin-allowed, it can proceed on an ultrafast timescale of less than several picoseconds, outcompeting most other loss mechanisms and reaching quantitative yields approaching 200%. Due to this high quantum efficiency, the singlet fission process shows promise as a means of reducing thermalization losses in photovoltaic cells. This would potentially allow for efficiency improvements beyond the thermodynamic limit in a single junction cell. Efforts to incorporate this process into solar photovoltaic cells have spanned a wide range of device structures over the past decade. In this review, we compare and categorize these attempts in order to assess the state of the field and identify the most promising avenues of future research and development.
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