School of Chemical & Biomedical Engineering & Centre for Advanced Bionanosystems, Nanyang Technological University, 70 Nanyang Drive, Singapore 637457.
J Am Chem Soc. 2010 Apr 7;132(13):4554-5. doi: 10.1021/ja1003735.
Free electrons and holes bounded by weak interactions in organic molecules must be generated from excitons to produce photocurrent in organic solar cells. Free charge carriers, in either small molecule- or polymer-based solar cells, are generated so far by dissociation of excitons at the donor-acceptor interface through injecting electrons (holes) from a donor (acceptor) into an acceptor (donor) while leaving holes (electrons) in the donor (acceptor). Here we report a new way, intermolecular exciton recombination, to generate free carriers from organic semiconductors. Unlike the exciton dissociation between donor and acceptor, the recombination of electrons from perfluorinated hexadecafluorophthalo-cyaninatozinc (F16ZnPc) with holes from fullerene (C(60)) frees their counterpart carriers. A new organic solar cell based on this intermolecular exciton recombination at the interface is fabricated to clearly demonstrate this new way to produce free carriers and then harvest electricity from sunlight.
在有机太阳能电池中，必须将弱相互作用束缚在有机分子中的自由电子和空穴从激子中产生出来，以产生光电流。在小分子或聚合物基太阳能电池中，自由电荷载流子迄今为止是通过将电子（空穴）从施主（受体）注入受体（施主）而从激子在施主-受体界面处解离来产生的，同时将空穴（电子）留在施主（受体）中。在这里，我们报告了一种从有机半导体中产生自由载流子的新方法，即分子间激子复合。与施主和受体之间的激子解离不同，来自全氟己基六氟酞菁锌（F16ZnPc）的电子与富勒烯（C（60））中的空穴的复合释放了它们的对应载流子。制造了一种基于这种界面处分子间激子复合的新型有机太阳能电池，以清楚地证明这种产生自由载流子并从阳光中获取电能的新方法。
