A high-efficiency poly(3-hexylthiophene)-based organic solar cell

Abstract

The invention discloses a high-efficiency organic solar cell based on poly(3-hexylthiophene), which comprises a substrate, a cathode, a cathode modification layer, an active layer, an anode modification layer and an anode, wherein the active layer is an electron donor and A blend film of electron acceptor, the electron donor is poly(3‑hexylthiophene) (P3HT), and the electron acceptor is the non-fullerene acceptor DFPCBR. Utilizing the large π-conjugated system and strong electron-donating properties of the central unit, DFPCBR has high HOMO energy levels and LUMO energy levels, which form a good match with the energy levels of P3HT, suppressing energy loss, and making solar cells have higher open circuit voltage. At the same time, the intramolecular charge transfer (ICT) of DFPCBR is enhanced, which narrows the band gap and broadens the absorption spectrum. Therefore, the organic solar cell prepared by the invention obtains a relatively high power conversion efficiency (PCE), the highest being 5.34%. At the same time, the organic solar cell prepared by the invention can still maintain a high PCE even when the active layer is relatively thick, which is beneficial to future practical applications.

Description

technical field

[0001] The invention relates to a solar cell, in particular to a high-efficiency organic solar cell based on poly(3-hexylthiophene). Background technique

[0002] Poly(3-hexylthiophene), referred to as P3HT, is the most widely used and researched electron donor in early organic solar cells. It is simple to synthesize, low in cost, and can adapt to large-area printing processes. Therefore, organic solar cells based on P3HT have Good prospects for commercial application. However, due to the high energy level of P3HT, the highest occupied molecular orbital (HOMO) energy level and the lowest unoccupied molecular orbital (LUMO) energy level are -4.76eV and -2.74eV, respectively, and the fullerene electrons originally matched with P3HT receptors such as PC 61 The LUMO energy level of BM is very low (-3.91eV), causing a large energy loss, resulting in a corresponding open-circuit voltage of the solar cell (V OC ) is low (~0.6V). In addition, P3HT has a wide band...

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