Pathways to a New Efficiency Regime for Organic Solar Cells
Pathways to a New Efficiency Regime for Organic Solar Cells
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DOI：
10.1002/aenm.201200103
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发表时间：
2012-10-01
影响因子：
27.8
通讯作者：
Hummelen, Jan C.
中科院分区：
文献类型：
--
作者：
Koster, L. Jan Anton;Shaheen, Sean E.;Hummelen, Jan C.
提出了三种不同的理论方法来确定功率转换效率超过20%的有机太阳能电池的途径。介绍了有机太阳能电池的辐射极限，阐明了电荷转移（CT）态吸收的作用。如果这种CT作用足够弱，有机太阳能电池可以像无机太阳能电池一样高效。接下来，基于Marcus电子转移理论的模型也考虑了电子供体和电子受体中激子的产生，以显示重组能量的降低如何导致效率的大幅提高。最后，介绍了介电常数作为高效太阳能电池的中心参数。通过使用漂移扩散模型，发现20%以上的效率是可以达到的。
Three different theoretical approaches are presented to identify pathways to organic solar cells with power conversion efficiencies in excess of 20%. A radiation limit for organic solar cells is introduced that elucidates the role of charge-transfer (CT) state absorption. Provided this CT action is sufficiently weak, organic solar cells can be as efficient as their inorganic counterparts. Next, a model based on Marcus theory of electronic transfer that also considers exciton generation in both the electron donor and electron acceptor is used to show how reduction of the reorganization energies can lead to substantial efficiency gains. Finally, the dielectric constant is introduced as a central parameter for efficient solar cells. By using a driftdiffusion model, it is found that efficiencies of more than 20% are within reach.