The Bulk Heterojunction in Organic Photovoltaic, Photodetector, and Photocatalytic Applications.,Advanced Materials

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The Bulk Heterojunction in Organic Photovoltaic, Photodetector, and Photocatalytic Applications.
Advanced Materials ( IF 27.4 ) Pub Date : 2020-08-05 , DOI: 10.1002/adma.202001763
Andrew Wadsworth ₁ , Zeinab Hamid ₁ , Jan Kosco ₂ , Nicola Gasparini ₁ , Iain McCulloch _{2,

3}

Affiliation

Organic semiconductors require an energetic offset in order to photogenerate free charge carriers efficiently, owing to their inability to effectively screen charges. This is vitally important in order to achieve high power conversion efficiencies in organic solar cells. Early heterojunction‐based solar cells were limited to relatively modest efficiencies (<4%) owing to limitations such as poor exciton dissociation, limited photon harvesting, and high recombination losses. The development of the bulk heterojunction (BHJ) has significantly overcome these issues, resulting in dramatic improvements in organic photovoltaic performance, now exceeding 18% power conversion efficiencies. Here, the design and engineering strategies used to develop the optimal bulk heterojunction for solar‐cell, photodetector, and photocatalytic applications are discussed. Additionally, the thermodynamic driving forces in the creation and stability of the bulk heterojunction are presented, along with underlying photophysics in these blends. Finally, new opportunities to apply the knowledge accrued from BHJ solar cells to generate free charges for use in promising new applications are discussed.

中文翻译：

有机光伏，光电探测器和光催化应用中的本体异质结。

有机半导体由于无法有效地筛选电荷，因此需要能量补偿才能有效地光生自由电荷载流子。为了在有机太阳能电池中实现高功率转换效率，这至关重要。早期的基于异质结的太阳能电池由于激子离解差，光子收集受限和重组损失高等限制因素而被限制在相对中等的效率（<4％）。本体异质结（BHJ）的开发已大大克服了这些问题，从而大大提高了有机光伏性能，目前已超过18％的功率转换效率。在这里，用于开发用于太阳能电池，光电探测器，讨论了光催化应用。此外，还介绍了整体异质结的创建和稳定性中的热力学驱动力，以及这些混合物中的潜在光物理性质。最后，讨论了利用BHJ太阳能电池知识积累产生免费电荷以用于有希望的新应用的新机会。

更新日期：2020-09-21

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