Correlating Charge Transport with Structure in Deconstructed Diketopyrrolopyrrole Oligomers: A Case Study of a Monomer in Field-Effect Transistors
Correlating Charge Transport with Structure in Deconstructed Diketopyrrolopyrrole Oligomers: A Case Study of a Monomer in Field-Effect Transistors
复制标题
解构二酮吡咯并吡咯低聚物中电荷传输与结构的关联：场效应晶体管中单体的案例研究
DOI：
10.1021/acsami.8b04711
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发表时间：
2018
影响因子：
9.5
通讯作者：
Patil, Satish
中科院分区：
文献类型：
--
作者：
Pickett, Alec;Torkkeli, Mika;Mukhopadhyay, Tushita;Puttaraju, Boregowda;Laudari, Amrit;Lauritzen, Andreas E.;Bikondoa, Oier;Kjelstrup-Hansen, Jakob;Knaapila, Matti;Patil, Satish
基于二酮基吡咯并吡咯（DPP）核的共聚物由于其在有机场效应晶体管（FET）中的高p型和n型载流子迁移率以及在太阳能电池结构中的高功率转换效率而吸引了很多关注。我们报道了用真空沉积和溶剂涂覆法制备的n-二烷基侧链取代噻吩DPP（Ph-TDPP-Ph）单体在FET中的结构和电荷传输性质。掠入射X射线衍射（GIXRD）从底栅，底接触FET架构进行了测量和不偏置。Ph-TDPP-Ph具有π共轭堆积方向的多晶型结构。该晶胞包含一种单体，其中对于一个相（TR 1），a = 20.89 °，B= 13.02 °，c= 5.85 °，α = 101.4°，β = 90.6°，和γ = 94.7°，或者包含两种单体，其中a = 24.92 °，B= 25.59 °，c= 5.42 °，α = 80.3°，β = 83.5°，第二相（TR 2）γ = 111.8°。因此，TR 2相位信号从分子的共面取向到人字形取向的转变。器件性能对薄膜中两个三斜相的比例敏感。一些最好的FET性能与p型载流子迁移率为0.1厘米2/V秒和开/关比为106的膜，主要包括TR 1相。来自可操作FET的GIXRD证明Ph-TDPP-Ph的结晶稳定性。
Copolymers based on diketopyrrolopyrrole (DPP) cores have attracted a lot of attention because of their high p-type as well as n-type carrier mobilities in organic field-effect transistors (FETs) and high power conversion efficiencies in solar cell structures. We report the structural and charge transport properties ofn-dialkyl side-chain-substituted thiophene DPP end-capped with a phenyl group (Ph-TDPP-Ph) monomer in FETs which were fabricated by vacuum deposition and solvent coating. Grazing-incidence X-ray diffraction (GIXRD) from bottom-gate, bottom-contact FET architectures was measured with and without biasing. Ph-TDPP-Ph reveals a polymorphic structure with π-conjugated stacking direction oriented in-plane. The unit cell comprises either one monomer witha= 20.89 Å,b= 13.02 Å,c= 5.85 Å, α = 101.4°, β = 90.6°, and γ = 94.7° for one phase (TR1) or two monomers witha= 24.92 Å,b= 25.59 Å,c= 5.42 Å, α = 80.3°, β = 83.5°, and γ = 111.8° for the second phase (TR2). The TR2 phase thus signals a shift from a coplanar to herringbone orientation of the molecules. The device performance is sensitive to the ratio of the two triclinic phases found in the film. Some of the best FET performances with p-type carrier mobilities of 0.1 cm2/V s and an on/off ratio of 106are for films that comprise mainly the TR1 phase. GIXRD from in operando FETs demonstrates the crystalline stability of Ph-TDPP-Ph.