Benzothiadiazole–triphenylamine as an efficient exciton blocking layer in small molecule based organic solar cells†,Sustainable Energy & Fuels

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Benzothiadiazole–triphenylamine as an efficient exciton blocking layer in small molecule based organic solar cells†
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2018-08-03 00:00:00 , DOI: 10.1039/c8se00251g
Laura Caliò _{1,

2,

3,

4} , Bhushan R. Patil _{5,

6,

7,

8,

9} , Johannes Benduhn _{10,

11,

12,

13,

14} , Koen Vandewal _{10,

11,

12,

13,

14} , Horst-Günter Rubahn _{5,

6,

7,

8,

9} , Morten Madsen _{5,

6,

7,

8,

9} , Samrana Kazim _{1,

2,

3,

4,

15} , Shahzada Ahmad _{1,

2,

3,

4,

15}

Affiliation

We have designed a small molecule based on benzothiadiazole–triphenylamine moieties (BTD–TPA₂), composed of an electron-poor benzothiadiazole core with two electron-rich triphenylamine arms. BTD–TPA₂ was synthesized in a facile manner using a Suzuki cross-coupling reaction. The molecule was rationally designed to take advantage of the synergistic effect of BTD, which allows the formation of a favorable band gap material, and triphenylamine (TPA) moieties, which favour efficient hole extraction and transport properties. A thin layer of BTD–TPA₂ was placed between the photo-active DBP/C₇₀ layer stack and the MoO_x electrical contact. With an optimized interlayer thickness of 35 nm, the attained photovoltaic properties were substantially superior to those of the reference devices. This has its origin in the dual functionality of BTD–TPA₂, i.e., efficient exciton blocking and improved hole extraction at the anode contact. The obtained results led to an improved power conversion efficiency of 5.66% for a vacuum deposited bilayer DBP/C₇₀ solar cell, which will be the new state of the art for bilayer DBP based solar cells.

中文翻译：

苯并噻二唑–三苯胺是基于小分子的有机太阳能电池中的有效激子阻挡层†

我们设计了一个基于苯并噻二唑-三苯胺部分（BTD-TPA ₂）的小分子，该分子由贫电子的苯并噻二唑核心和两个富电子的三苯胺臂组成。使用Suzuki交叉偶联反应可以轻松地合成BTD-TPA ₂。对分子进行了合理设计，以利用BTD的协同效应，后者可形成有利的带隙材料和三苯胺（TPA）部分，从而有利于有效的空穴提取和传输性能。在光敏DBP / C ₇₀叠层与MoO _x之间放置一薄层BTD–TPA ₂电气接触。在35 nm的最佳夹层厚度下，所获得的光伏性能大大优于参考器件。这源于BTD–TPA ₂的双重功能，即有效的激子阻挡和在阳极触点处改善的空穴提取。获得的结果导致真空沉积的双层DBP / C ₇₀太阳能电池的功率转换效率提高了5.66％，这将成为基于DBP双层太阳能电池的最新技术。

更新日期：2018-08-03

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