Terpolymer receptor booster efficiency solar cells all together

Full polymer solar cells (All-polymersolar cells, all-PSCs) polymer based donor and acceptor polymer solar cells, its good thermal stability, high mechanical strength and stretchability of other unique advantages, suitable for wearable devices and flexible potential applications, however, the whole high-performance polymer battery performance behind a small molecule receptor device. The main reason is due to total all-polymer-polymer cell receptor is selectively less, more currently used are based on PDI and polymer NDI receptor, the presence of low absorption coefficient, miscibility with the polymer to form a difference , a strong degree of crystallinity, the polymer receptor and other shortcomings of poor electron mobility, has a negative effect both light current and fill factor (FF). 化学所李永舫院士团队:三元共聚受体助力高效全聚太阳能电池

Analytical graphic

with a simple bridging unit PSMAs conjugated small molecule receptor (SMA) polymerized, having a broad absorption range, advantages of the strong absorbance of SMAs, which is a strategy preparation of polymer receptor species promising. LEE Fang team with this strategy, the modified thiophene small molecule receptor Y6 different molar amounts of 3-ethyl-thiophene (ET) polymerized units, a series of synthetic polymers receptor PTPBT-ETx. Compared with only y6 PTPBT unit and the thiophene unit, ET added units in the terpolymer PTPBT-ETx (where x is the molar ratio of units ET) exhibits a rising LUMO level, electron mobility and increase the polymer blends to improve blend film morphology PBDB-T thereof. And based PBDBT: PTPBT-ET0.3 solar cell to achieve full polymerization of more than 12.5% ​​of the high power conversion efficiency (PCE), having a further long-term optical stability of more than 300 hours. The results show that, three yuan random small molecule receptor function unit and the third unit are all polymer copolymerized polymer in the development of efficient receptor a simple and effective strategy. In the paper entitled \”Strategy random terpolymer synthesized high performance solar cell having a whole polymer molecular receptor\” should be issued based on the well-known international journals Germany. This article is the corresponding author Lee Wing Fang Institute of Chinese Academy of Sciences Chemistry, Meng Lei researcher.

FIG. 1: PTPBT-ETx receptor polymer a) molecular structure and b) a band diagram. Chloroform (c) solution and the solid film (d) inPTPBT-ETxs normalized UV – visible absorption spectrum.
Figure 2: Full photovoltaic performance of polymer solar cells: a) based on PBDB-T: PTPBT-ETx device under AM1.5G, light 100mw / cm2 of JV curve. b) EQE respective full spectrum of polymer solar cells. Comparative molar ratio c) a copolymer different ET receptors whole polymer solar cells and the PCE Voc values. d) PTPBT-ET0.3 all polymer-based solar cell under a long PCE 1x normalized illumination curve.
Figure 3: dissolved in chloroform solvent a) PBDB-T: PTPBT, b) PBDB-T: PTPBT-ET0.3, c) PBDB-T: PTPBT-ET0.75 blend films 2DGIWAXS FIG 2.d) from PBDB-T: crystal plane PTPBT-ETx blend films (010) diffraction d- spacings and coherence length

summarize [ 123] random terpolymer molecular strategy using Y6, thiophene units and a control unit molar ratio ET, a series of all-polymer PTPBT-ETx polymer not containing ET receptor receptor PTPBT comparison unit , mixed with a certain amount of ET in the copolymer backbone unit, not only can increase the LUMO level of the polymer receptor, and such that the polymer blend membrane source PBDB-T has a higher charge mobility and good shape appearance. Based PTPBT-ETxs all polymer solar cell receptor, ET receptor with increasing polymer content, Voc is gradually increased. Based PBDT-T: PTPBT-ET0.3 all-polymer battery Voc, Jsc, FF best synergistic effect, preferably PCE 12.52%. Further, based on the entire polymer PTPBT-ET0.3 battery shows significant long-term optical stability over 300 hours, and did not initially apparent \”age\” degraded. Proved to further improve the above-mentioned random terpolymer PSMA receptors may lead to further development of the whole polymer battery of high-performance polymers of the PCE receptor. The full text link:

https: // do i.org/10.1002/ anie .202005357