Trans-organic thin film solar cell modified by polarity buffer layer

Abstract

The invention discloses a trans-organic thin film solar cell modified by a polarity buffer layer, and belongs to the field of organic polymer photovoltaic devices or organic semiconductor thin film solar cells. A trans-structure is adopted for the cell, and a substrate, a transparent conductive cathode ITO, a cathode buffer layer, a light active layer, an anode buffer layer, the polarity buffer layer and a metal anode are arranged from bottom to top; the polarity buffer layer comprises, by mass, 93 percent to 97 percent of N, N- dimethyl formamide, three percent to seven persent of poly (3, 4- ethylene thiophene two oxygen radicals)-poly (styrene sulfonic acid), and the thickness of the polarity buffer layer ranges from 1 nm to 10 nm. The polarity buffer layer is added between the anode buffer layer and the metal anode, so that the work function of the anode buffer layer is improved, device series resistance is reduced, the film forming process of the anode buffer layer is optimized, charge carrier composite probability is reduced, the vertical phase separation degree of PEDOT: PSS thin film is promoted, transmission efficiency of the charge carrier is improved, and the photoelectric conversion efficiency of the device is improved.

Description

technical field [0001] The invention belongs to the field of organic polymer photovoltaic devices or organic semiconductor thin-film solar cells, and in particular relates to an organic thin-film solar cell. Background technique [0002] With the explosive growth of the global energy demand, the energy problem has become the primary problem faced by the economic development of all countries. Because solar energy is clean, widely distributed, and inexhaustible, research on photovoltaic power generation to solve energy problems has become the focus and focus of research in the field of renewable energy. Currently, active layer materials can be classified into inorganic semiconductor materials and organic semiconductor materials according to the different properties of materials that make up the photoactive layer of a solar cell. Compared with inorganic semiconductor materials, organic semiconductor materials not only have relatively mild synthesis conditions and device proces...

AI Technical Summary

Problems solved by technology

[0004] However, in the inverted structure solar cell, the main limiting factors of PEDOT:PSS are: 1. The work function mismatch between the anode buffer layer PEDOT:PSS and the metal anode makes it impossible to form an ohmic contact between them, resulting in a large series resistance of the device, and finally The short-circuit current density is limited; 2. The polarity of the solvent of the anode buffer layer and the solvent of the photoactive layer is different, resulting in uneven film formation on the surface of the photoactive layer, which will lead to an excessive density of carrier traps on the surface of the anode buffer layer, thereby increasing The recombination probability of carriers is increased; 3. The hydrophobic and conductive PEDOT groups and the hydrophilic and non-conductive PSS groups cannot effectively conduct vertical phase separation during the film formation process, thus limiting the carrier transport efficiency

Images