Organic Photovoltaics: Direct Free Carrier Photogeneration in Single Layer and Stacked Organic Photovoltaic Devices (Adv. Mater. 22/2017)

In article number 1606909, Ming-Fai Lo, Chun-Sing Lee, and co-workers report unusual free-carrier generation in some bipolar organic materials (SubNc and SubPc) upon photoexcitation. Single-layer devices with SubNc or SubPc sandwiched between two electrodes can give power conversion efficiencies 30 times higher than previously reported single-layer devices. Interestingly, these photoactive layers can be stacked onto each other with any sequence to generate a photocurrent in OPV devices.

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