Pushing the Envelope of the Intrinsic Limitation of Organic Solar Cells

被引:61
作者
Camaioni, Nadia [1 ]
Po, Riccardo [2 ]
机构
[1] CNR, Ist Sintesi Organ & Fotoreatt, I-40129 Bologna, Italy
[2] ENI SpA, Ist ENI Donegani, Res Ctr Non Convent Energies, I-28100 Novara, Italy
来源
JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2013年 / 4卷 / 11期
关键词
CHARGE-TRANSFER EXCITONS; PHOTOINDUCED ELECTRON-TRANSFER; OPEN-CIRCUIT VOLTAGE; TRANSFER STATE; PHOTOVOLTAIC APPLICATIONS; BRANCHED PHTHALOCYANINE; GEMINATE RECOMBINATION; CONVERSION EFFICIENCY; BULK HETEROJUNCTIONS; CONJUGATED POLYMER;
D O I
10.1021/jz400374p
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The photogeneration of Frenkel-type excitons, instead of pairs of free charges, is one of the main drawbacks of organic photovoltaics, when compared with the inorganic counterpart. The strong Coulomb interaction of charge carriers of opposite sign in organic materials is responsible for the complexity of the process of generation of unbound charges, affecting the photogenerated current and still not clearly understood, as well as for the free energy loss of electrons resulting in a diminished open circuit voltage. Despite this practical limitation, record power conversion efficiencies approaching 10% are currently reported for lab-scale single-junction structures made of low-bandgap electron-donating conjugated small molecules or polymers blended with electron-accepting fullerene derivatives. To go beyond, a deep understanding of charge generation dynamics, highly system dependent, is necessary for the definition of the rules for the design of high-performance organic materials for the photovoltaic application and possibly the reduction of exciton binding energy, through the increase of the dielectric constant, which definitively would overcome the practical constraints to high efficiency organic solar cells.
引用
收藏
页码:1821 / 1828
页数:8
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