Comparison among Perylene Diimide (PDI), Naphthalene Diimide (NDI), and Naphthodithiophene Diimide (NDTI) Based n-Type Polymers for All-Polymer Solar Cells Application,Macromolecules

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Comparison among Perylene Diimide (PDI), Naphthalene Diimide (NDI), and Naphthodithiophene Diimide (NDTI) Based n-Type Polymers for All-Polymer Solar Cells Application
Macromolecules ( IF 5.1 ) Pub Date : 2017-04-13 00:00:00 , DOI: 10.1021/acs.macromol.7b00414
Jing Yang _{1,

2} , Bo Xiao _{1,

2} , Keisuke Tajima ₃ , Masahiro Nakano ₃ , Kazuo Takimiya ₃ , Ailing Tang ₁ , Erjun Zhou ₁

Affiliation

Rylene dimides are widely used as the building blocks for n-type semiconducting polymers due to the tunable electronic properties. To elucidate their potentials as the electron acceptors in all-polymer solar cells, systematic comparisons of the properties among the derivatives are necessary. Herein, we used perylene diimide (PDI), naphthalene diimide (NDI), and naphthodithiophene diimide (NDTI) with the same alkyl chains combined with dithienothiophene (DTT) unit to obtain three polymer acceptors PPDI-DTT, PNDI-DTT, and PNDTI-DTT, respectively. Light absorption, carrier mobility, film morphology, and molecular orientation were characterized and compared. The photovoltaic devices based on PPDI-DTT, PNDI-DTT, and PNDTI-DTT achieved power conversion efficiency (PCE) of 3.49, 2.50, and 5.57%, respectively, in combination with BDDT as the donor polymer. The high performance of PNDTI-DTT was attributed to the strong absorption profile in the near-infrared (NIR) region, high and balanced electron and hole mobilities, and the preferable face-on orientation for the polymer chains in the blend films. The results indicate that NDTI is a promising building block to construct n-type photovoltaic polymers, and higher photovoltaic performance is anticipated with the further development of novel NDTI-based polymers.

中文翻译：

Per二酰亚胺（PDI），萘二酰亚胺（NDI）和萘二噻吩二酰亚胺（NDTI）的用于全聚合物太阳能电池的n型聚合物的比较

由于可调节的电子特性，二萘嵌苯二甲酰亚胺被广泛用作n型半导体聚合物的结构单元。为了阐明它们在全聚合物太阳能电池中作为电子受体的潜力，必须对衍生物之间的性能进行系统比较。在本文中，我们将具有相同烷基链的per二酰亚胺（PDI），萘二酰亚胺（NDI）和萘二噻吩二酰亚胺（NDTI）与二噻吩并噻吩（DTT）单元结合使用，以获得三个聚合物受体PPDI-DTT，PNDI-DTT和PNDTI- DTT，分别。表征并比较了光吸收，载流子迁移率，膜形态和分子取向。基于PPDI-DTT，PNDI-DTT和PNDTI-DTT的光伏器件结合BDDT作为施主聚合物，分别实现了3.49、2.50和5.57％的功率转换效率（PCE）。PNDTI-DTT的高性能归因于在近红外（NIR）区域的强吸收分布，高且平衡的电子和空穴迁移率，以及共混膜中聚合物链的优选面朝取向。结果表明，NDTI是构建n型光伏聚合物的有前途的基石，并且随着新型NDTI基聚合物的进一步发展，有望实现更高的光伏性能。

更新日期：2017-04-13

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