Spatially Resolved Spectroscopic Mapping of Photocurrent and Photoluminescence in Polymer Blend Photovoltaic Devices
Spatially Resolved Spectroscopic Mapping of Photocurrent and Photoluminescence in Polymer Blend Photovoltaic Devices
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DOI：
10.1021/jp205880t
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发表时间：
2011-09
影响因子：
3.7
通讯作者：
T. Brenner;C. McNeill
中科院分区：
文献类型：
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作者：
T. Brenner;C. McNeill
结合共聚焦光致发光和光电流显微镜，研究了基于聚合物PFB（聚（9,9 ' -二辛基芴-co-双-N，N ' -（4-丁基苯基）-双-N，N ' -苯基-1,4-苯二胺））和F8BT（聚（9,9 ' -二辛基芴-co-苯并二噻唑））共混物的聚合物太阳能电池中共混物形态、聚合物构象和光电流产生之间的相互作用。获得了混合物的二维光致发光光谱图，允许识别区域的组成，而使用不同的激光源允许具有选择性激发的光电流成像。光致发光映射还促进了每个域的异构体发射和光电流产生之间的关联。我们发现，无论激发源是什么（375 nm， PFB优先吸收；405 nm，等吸收；445 nm， F8BT优先吸收），富F8BT区域的光电流都更高，尽管优先激发PFB时差异较小....
Combined confocal photoluminescence and photocurrent microscopy is used to study the interplay between blend morphology, polymer conformation, and photocurrent generation in polymer solar cells based on blends of the polymers PFB (poly(9,9′-dioctylfluorene-co-bis-N,N′-(4-butylphenyl)-bis-N,N′-phenyl-1,4-phenylenediamine)) and F8BT (poly(9,9′-dioctylfluorene-co-benzodiathiazole)). Two-dimensional photoluminescence spectral maps of the blend are acquired that allow for the composition of the domains to be identified, whereas the use of different laser sources allows for photocurrent imaging with selective excitation. Photoluminescence mapping additionally facilitates correlation between exciplex emission and photocurrent generation for each domain. We find that photocurrent is higher in F8BT-rich domains regardless of excitation source (375 nm, preferential absorption by PFB; 405 nm, equal absorption; 445 nm, preferential absorption by F8BT) though the discrepancy is less when PFB is preferentially excited....