Firdaus Yuliar, Le Corre Vincent M, Khan Jafar I, Kan Zhipeng, Laquai Frédéric, Beaujuge Pierre M, Anthopoulos Thomas D
King Abdullah University of Science and Technology (KAUST) KAUST Solar Center (KSC) Division of Physical Sciences and Engineering Thuwal 23955-6900 Saudi Arabia.
University of Groningen Zernike Institute for Advanced Materials Nijenborgh 4 9747 AG Groningen The Netherlands.
Adv Sci (Weinh). 2019 Mar 10;6(9):1802028. doi: 10.1002/advs.201802028. eCollection 2019 May 3.
The reported power conversion efficiencies (PCEs) of nonfullerene acceptor (NFA) based organic photovoltaics (OPVs) now exceed 14% and 17% for single-junction and two-terminal tandem cells, respectively. However, increasing the PCE further requires an improved understanding of the factors limiting the device efficiency. Here, the efficiency limits of single-junction and two-terminal tandem NFA-based OPV cells are examined with the aid of a numerical device simulator that takes into account the optical properties of the active material(s), charge recombination effects, and the hole and electron mobilities in the active layer of the device. The simulations reveal that single-junction NFA OPVs can potentially reach PCE values in excess of 18% with mobility values readily achievable in existing material systems. Furthermore, it is found that balanced electron and hole mobilities of >10 cm V s in combination with low nongeminate recombination rate constants of 10 cm s could lead to PCE values in excess of 20% and 25% for single-junction and two-terminal tandem OPV cells, respectively. This analysis provides the first tangible description of the practical performance targets and useful design rules for single-junction and tandem OPVs based on NFA materials, emphasizing the need for developing new material systems that combine these desired characteristics.
据报道，基于非富勒烯受体（NFA）的有机光伏电池（OPV）的功率转换效率（PCE），单结和双端串联电池目前分别超过了14%和17%。然而，要进一步提高PCE，需要更好地理解限制器件效率的因素。在此，借助一个数值器件模拟器来研究基于NFA的单结和双端串联OPV电池的效率极限，该模拟器考虑了活性材料的光学性质、电荷复合效应以及器件活性层中的空穴和电子迁移率。模拟结果表明，在现有材料体系中易于实现的迁移率值下，单结NFA OPV有潜力达到超过18%的PCE值。此外，研究发现，对于单结和双端串联OPV电池，平衡的电子和空穴迁移率大于10 cm² V⁻¹ s⁻¹ ，再加上低的非Geminate复合速率常数10⁻¹⁰ cm³ s⁻¹ ，分别可导致PCE值超过20%和25%。该分析首次切实描述了基于NFA材料的单结和串联OPV的实际性能目标及有用的设计规则，强调了开发具有这些理想特性的新材料体系的必要性。
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