Improving charge transport by the ultrathin QDs interlayer in polymer solar cells

Abstract

Lead sulfide (PbS) quantum dots (QDs) have been incorporated into PTB7:PC71BM BHJ active layers to fabricate polymer solar cells (PSCs) and gather on the top surface of active layers to form an ultrathin interlayer.

The effect of PbS quantum dots on molecular dynamics and conductivity of PTB7:PC71BM bulk heterojunction as revealed by dielectric spectroscopy

“…S2 (ESI †) demonstrates a smooth surface morphology with a root mean square value of 0.775 nm. This value is typical for PTB7:PC71BM:QD composite surfaces 9,15,18,19 and lower than that for the binary PTB7:PC71BM blend (5.45 nm 29 ). The discovered smooth surface indicates good compatibility in a three-component system, ensuring good contact between layers and low interface resistance to encourage charge extraction and transport.…”

“…The discovered smooth surface indicates good compatibility in a three-component system, ensuring good contact between layers and low interface resistance to encourage charge extraction and transport. 9 Meanwhile, an increase in the PbS QD loading tends to increase the phase separation scale as shown in Fig. S3 and S4 (ESI †), thus decreasing the quality of the interfaces which is harmful for efficient charge transport.…”

“…For improving the OSC performance, the strategy of incorporating a third optically active component, inorganic quantum dots (QDs), into the binary BHJ blend has been experimentally proved. 6,7 In the literature, [8][9][10][11][12][13][14][15][16][17][18][19][20][21] we found reports on the successful incorporation of semiconducting QDs into photovoltaic blends or QD layer deposition, and both allowed improving the photovoltaic device performance. As donor components, conventional polymers, such as poly[N-9 00 -hepta-decanyl-2,7-carbazole-alt-5,5-(4 0 ,7 0 -di-2thienyl-2 0 ,1 0 ,3 0 -benzothiadiazole)] (PCDTBT), poly{ [4,8-bis [(2-ethylhexyl) [3,4-b]-thiophenediyl]} (PTB7-Th), have been used.…”

The hydrothermal synthesis of blue-emitting boron-doped CQDs and its application for improving the photovoltaic parameters of organic solar cell

“…Carbon quantum dots (CQDs) have caught attention with regard to its advantages such as a high carrier mobility, high conductivity, a wide absorption range, a narrow emission range and stability. 24 Being able to control the size of CQDs can make possible the adjustment of the energy levels of the valence band and conduction band of CQDs, which can lead to use in different applications. [25][26][27] Furthermore, a number of techniques for the synthesis of CQDs have been demonstrated, including hydrothermal, microwave, laser ablation, arc discharge, acidic oxidation, electrochemistry, pyrolysis techniques.…”

With PBDB-T as the Donor, the PCE of Non-Fullerene Organic Solar Cells Based on Small Molecule INTIC Increased by 52.4%

“…Solar cells based organic materials have attracted more and more attention as promising candidates for solving problems of the global energy shortage and climate change, because of the advantages of their lighter weight, lower production costs, simple manufacturing processes, easy preparation of flexible devices and easy mass production [1][2][3][4][5][6][7]. Fullerene derivatives are widely used as acceptor materials for organic solar cells because of their excellent electron transport property and easy to form good bulk heterojunctions with polymer or small molecular donors [8,9].…”