Construct the Relationship Between Film Morphology and Device Performance

4 Construct the Relationship Between Film Morphology and Device Performance 

There is a close relationship between the morphology of active layers and performance (physical processes) of conjugated-polymer-based photovoltaic cells, which is quite important for the further performance improvement. The morphological characteristics include ordered packing of donor/acceptor materials, domain size, phase-separation stracture and interfacial diffusion structure, while physical processes include exciton diffusion, charge-transfer state separation, lifetime of charge carrier, and carrier mobility. 

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In the following, we show in detail the strategies to improve the performance of all-polymer photovoltaic cells, which is directly related to the nanostructures of phase separation in active layer, in four aspects (i) Establish interpenetrating network structure by controlling phase separation, (ii) control the domain size and purify the domains, (iii) adjust the diffused structure at the interface between donor and acceptor, (iv) and construct the relationship between film morphology and device performance. 

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