Performance, Morphology, and Charge Recombination Correlations in Ternary Squaraine Solar Cells
Performance, Morphology, and Charge Recombination Correlations in Ternary Squaraine Solar Cells
复制标题
三元方酸太阳能电池的性能、形态和电荷复合相关性
DOI：
10.1021/acs.chemmater.8b02746
复制
发表时间：
2018
影响因子：
8.6
通讯作者：
Facchetti Antonio
中科院分区：
文献类型：
--
作者：
Chen Yao;Yang Lin;Wu Jianglin;Wang Gang;Huang Wei;Melkonyan Ferdin;S.;Lu Zhiyun;Huang Yan;Marks Tobin J.;Facchetti Antonio
通过组合具有互补光吸收的两种方酸供体（USQ 3OH和IDPSQ）和作为受体的PC 71 BM来展示三元本体异质结有机太阳能电池（BHJ-OSC）。虽然相应的二元电池表现出4.65%（IDPSQ二元）和6.85%（USQ 3OH二元）的最大功率转换效率（PCE），但重量组成IDPSQ：USQ 3OH：PC 71 BM = 0.15：1.0：3.0（15%TB，TB =三元共混物）的三元电池表现出7.20%的PCE，这是迄今为止方酸OSC的最高已知值。方酸和空间电荷限制电流（SCLC）测量的单晶解释了二元电池之间的效率差异。三元器件的SCLC测量和透射电子显微镜成像表明，与基于USQ 3OH共混物的器件相比，15%TB器件的电荷迁移率略有增加，BHJ畴尺寸优化。掠入射广角X射线散射数据表明，三元共混膜经热退火后，π-π堆积增强，相关长度增大。电荷复合测量表明，IDPSQ可以被纳入到共混物中，而不增加电荷复合。最后，在PET（聚对苯二甲酸乙二醇酯）上制造了具有约4.5%的PCE的柔性OSC。这项研究表明，容易获得的方酸菁核代表了一个可行的选择，设计新的有机太阳能电池供体材料。
Ternary bulk-heterojunction organic solar cells (BHJ-OSCs) are demonstrated by combining two squaraine donors (USQ3OH and IDPSQ) having complementary optical absorption and PC71BM as the acceptor. While the corresponding binary cells exhibit maximum power conversion efficiencies (PCEs) of 4.65% (IDPSQ binary) and 6.85% (USQ3OH binary), the ternary cells of weight composition IDPSQ:USQ3OH:PC71BM = 0.15:1.0:3.0 (15%TB, TB = ternary blend) exhibit a PCE of 7.20%, which is the highest known value to date for a squaraine OSC. Single crystals of both squaraines and space-charge-limited current (SCLC) measurements explain the efficiency difference between the binary cells. SCLC measurements and transmission electron microscopy imaging of the ternary devices indicate that the charge mobility slightly increases and the BHJ domain size optimizes for the 15%TB device vs that based on the USQ3OH blend. Grazing incidence wide-angle X-ray scattering data reveal that enhanced π–π stacking and larger correlation lengths can be achieved after thermal annealing of the ternary blend film. Charge recombination measurements demonstrate that IDPSQ can be incorporated into the blend without increasing charge recombination. Finally, flexible OSCs on PET (polyethylene terephthalate) with a PCE of ∼4.5% were fabricated. This study demonstrates that readily accessible squaraine cores represent a viable choice for the design of new organic solar cell donor materials.