Inverted bulk heterojunction organic solar cell

Abstract

The invention belongs to the technical field of organic solar cell device design and preparation and especially relates to an inverted bulk heterojunction organic solar cell of which active layer is equipped with a three-dimensional structure, and a preparation method. The three-dimensional structure is embossed by employing a PDMS template. The inverted bulk heterojunction organic solar cell is composed of a cathode layer, an electron transfer layer, the active layer, a hole transfer layer and an anode layer. The cathode layer is indium tin oxide ITO. The electron transfer layer is ZnO with thickness of 10+ / -0.2 nanometers. The active layer is PTB7:PC <70>BM with the thickness of 100+ / -0.2 nanometers. The hole transfer layer is MoO <3> with the thickness of 3+ / -0.2 nanometers. The anode layer is silver with the thickness of 100+ / -0.2 nanometers. Three-dimensional patterns embossed by employing the PDMS template are arranged on the active layer. The invention also discloses a specific preparation method.

Description

technical field [0001] The invention belongs to the technical field of design and preparation of organic solar cell devices, in particular to an inverted organic solar cell with a three-dimensional structure imprinted with a PDMS (polydimethylsiloxane) template on the surface of an active layer and a manufacturing method thereof. Background technique [0002] Organic solar cells (OSCs) have attracted much attention due to their advantages of simple fabrication process, low cost, fabrication on flexible substrates, and light weight. The bulk heterojunction organic solar cells currently studied have two structures, the positive structure with ITO as the anode and the inverted structure with ITO as the cathode. Inverted structure organic solar cells have many advantages compared with upright structure organic solar cells. First, because the buffer layer PEDOT:PSS is not used in the inverted structure, the inverted structure has a longer life; secondly, the high work function m...

AI Technical Summary

Problems solved by technology

However, whether it is an organic solar cell with an upright structure or an inverted structure, the absorption efficiency of the active layer material for sunlight is still not high, so the power conversion efficiency of the organic solar cell is low.

Although increasing the thickness of the active layer can effectively improve light absorption, too thick an active layer is not conducive to the transport and collection of carriers, thus affecting the improvement of power conversion efficiency.

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