In recent years, the ternary strategy has proven to be an effective strategy to enhance the performance of organic solar cells. Currently, the general selection criterion for the third component is the complementary absorption spectrum with the binary host system to promote ternary activity. Layer-on-photon capture. We propose a new strategy to select the third component for the preparation of high-efficiency ternary non-fullerene solar cells: Based on two binary subcells with complementary photoelectric parameters.
'Introduction to achievements'
Recently, Zhang Fujun's group at Beijing Jiaotong University reported a new strategy to prepare ternary non-fullerene solar cells. In this work, non-fullerene cells were prepared using polymer J71 as the donor material. The small molecule IT-M with almost the same gap, ITIC, is the acceptor material. Although the two acceptor materials have almost the same bandgap, the photoelectric parameters of the two prepared dual cells have large differences. Ternary batteries are good. The inheritance of the advantages of two dual sub-cells, PCE from 10.68% to 11.60%. Related content entitled 'Ternary Non- fullerene PSCs with PCE of 11. 6% by Inheriting the Advantages of Binary Cells Posted on ACS Energy Letters. The first author of this article is master student Hu Zhenghao.
'Tutorial Reading'
Figure 1. TOC diagram
Figure 2. Structure and material properties of non-fullerenes organic solar cell devices
(a) Device structure;
(b) the molecular formula of the material;
(c) Standardized ultraviolet-visible absorption spectra of J71, IT-M and ITIC films;
(d) The energy level of the material.
Figure 3. Characterization of Optoelectronic Properties of Optimal Binary and Ternary Organic Solar Cell Devices
(a) 100 mW cm - 2The current intensity-voltage curve of optimal binary and ternary organic solar cell devices under illumination;
(b) External quantum efficiency of optimal binary and ternary organic solar cell devices;
(c) Absorption spectra of thin films of different ITIC content devices (illustrated as IT-M, ITIC thin film absorption coefficient);
(d) Photocurrent density-effective voltage curves for optimal binary and ternary organic solar cell devices.
Figure 4. Optoelectronic properties of optimal binary and ternary organic solar cell device films
(a) Short-circuit current strength results of the optimal binary and ternary organic solar cell devices under different light intensities and the short-circuit current intensity-linear fitting results of the light intensity;
(b) Open-circuit voltage results of the optimal binary and ternary organic solar cell devices and open-circuit voltage-light intensity linear fitting results under different light intensities;
(c) Hole mobility for optimal binary and tertiary components;
(d) Optimal binary and three-component electron mobility.
'to sum up'
This strategy uses two binary subcells with complementary photoelectric parameters as the selection criteria. The prepared three-cell battery inherits the advantages of two dual subcells, and its PCE increases nearly 1 percentage point. The proposed strategy breaks the tradition. The idea of choosing the third component of the ternary battery to absorb the spectrum complementarity as the primary criterion is beneficial to the further development of the ternary battery.
