Key Tradeoffs Limiting the Performance of Organic Photovoltaics
Key Tradeoffs Limiting the Performance of Organic Photovoltaics
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DOI：
10.1002/aenm.201703551
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发表时间：
2018-10-05
影响因子：
27.8
通讯作者：
Riede, Moritz
中科院分区：
文献类型：
--
作者：
Ramirez, Ivan;Causa, Martina;Riede, Moritz
2017年发表了几种新的材料系统，这些系统挑战了长期以来的概念，即驱动力是有机光致发光（OPV）中有效激子解离所必需的，并且电荷转移态E-ct的能量与对应于开路的能量之间的损失通常约为0.6 eV。鉴于这些发展，作者结合联合收割机的见解，从设备的物理和光谱审查两个关键的权衡限制OPV的性能。这些是电荷载流子生成效率和可实现的开路电压（V-oc）之间的权衡以及器件厚度（光吸收）和填充因子之间的权衡。几种竞争性非富勒烯受体（NFA）的出现令人兴奋。作者分析了是什么使这些材料与富勒烯相比，包括分子振动的潜在作用，并讨论了新分子的设计标准和可实现的功率转换效率。
2017 saw the publication of several new material systems that challenge the long-held notion that a driving force is necessary for efficient exciton dissociation in organic photovoltaics (OPVs) and that a loss of approximate to 0.6 eV between the energy of the charge transfer state E-ct and the energy corresponding to open circuit is general. In light of these developments, the authors combine insights from device physics and spectroscopy to review the two key tradeoffs limiting OPV performances. These are the tradeoff between the charge carrier generation efficiency and the achievable open circuit voltage (V-oc) and the tradeoff between device thickness (light absorption) and fill factor. The emergence of several competitive nonfullerene acceptors (NFAs) is exciting for both of these. The authors analyze what makes these materials compare favorably to fullerenes, including the potential role of molecular vibrations, and discuss both design criteria for new molecules and the achievable power conversion efficiencies.