Effects of Layer Thickness and Annealing of PEDOT:PSS Layers in Organic Photodetectors
Effects of Layer Thickness and Annealing of PEDOT:PSS Layers in Organic Photodetectors
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DOI：
10.1021/ma901182u
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发表时间：
2009-09-08
期刊：
影响因子：
5.5
通讯作者：
Greenham, Neil C.
中科院分区：
文献类型：
--
作者：
Friedel, Bettina;Keivanidis, Panagiotis E.;Greenham, Neil C.
本文研究了电极聚合物聚（3,4-乙烯二氧噻吩）：聚苯乙烯磺酸（PEDOT:PSS） （PEDOT:PSS）的厚度变化和热处理对以共轭聚合物共混物为光活性材料的光伏和光电探测器器件的影响，通过PEDOT:PSS层厚度在25 ~ 150 nm之间的变化，我们发现了最佳的器件性能，特别是低暗电流和高外量子效率（EQE）和开路电压（V-oc）。大约70纳米。这是在两个不同的活动层中观察到的。对PEDOT:PSS薄膜进行退火研究，温度在120到400摄氏度之间变化，在250摄氏度下显示出最佳的器件性能，特别是EQE和V-oc，这种最佳性能被发现与PEDOT:PSS颗粒的PSS壳中的水分损失有关。当退火温度高于260℃时，器件性能显著降低。这与导致磺酸损失的化学分解有关，尽管这对面内电导率没有显著影响。
We have investigated the effects of thickness variation and thermal treatment of the electrode polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) (PEDOT:PSS) in photovoltaic and photodetector devices using conjugated polymer blends as the photoactive material, By variation of the PEDOT:PSS layer thickness between 25 and 150 nm, we found optimum device performance, in particular low dark current and high external quantum efficiency (EQE) and open-circuit voltage (V-oc), at around 70 nm. This has been observed for two different active layers. Annealing studies oil the PEDOT:PSS films, with temperatures varied between 120 and 400 degrees C, showed an optimum device performance, in particular EQE and V-oc at 250 degrees C. This optimum performance was found to be associated with loss of water from the PSS shell of the PEDOT:PSS grains. For annealing temperatures above 260 degrees C, device performance was dramatically reduced. This was associated with chemical decomposition leading to loss of sulfonic acid, although this did not significantly affect the in-plane conductivity.