Patent•
Perovskite solar cell and preparation method thereof
11 Feb 2020-
TL;DR: In this paper, a perovskite solar cell with a birch element and a thin film structure is characterized, and a preparation method for perovsite solar cells is presented.
Abstract: The invention discloses a perovskite solar cell and a preparation method thereof. The perovskite solar cell is characterized in that a hole transport layer, a perovskite layer, an electron transport layer and a cathode interface buffer layer are sequentially deposited or spin-coated on a transparent conductive substrate, and then a metal electrode is evaporated on the cathode interface buffer layer. The preparation method for the perovskite solar cell with a birch element and a thin film structure comprises the following steps of: doping F4TCNQ in PTAA, preparing a perovskite precursor, preparing PC61BM, and preparing a BCP spin-coating solution. Compared with the prior art, the perovskite solar cell has the advantages that perovskite grains are large, the defects at the grain boundary andon the surface of perovskite are passivated, the water resistance of perovskite is enhanced, the energy conversion efficiency of the cell exceeds 21%, the stability is good, the process is simple, the operation is convenient, the manufacturing cost is low, and the popularization and application of solar photovoltaic power generation in China are greatly promoted.
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TL;DR: In this article, a solution-processed planar heterojunction organometallic trihalide perovskite solar cell can be increased to 17.5% through doping the hole transporting layer for reducing the resistivity.
255 citations
TL;DR: The perovskite hybrid photodetector as discussed by the authors provides low dark current densities and high externalquantum efficiencies, resulting in a photoder with enhanced photoresponsivity and detectivity.
Abstract: A photodetector includes an active layer formed of an inorganic/organic hybrid perovskite material, such as organometal halide perovskites. The perovskite hybrid photodetector provides low dark-current densities and high external-quantum efficiencies, resulting in a photodetector with enhanced photoresponsivity and detectivity. Advantageously, the perovskite hybrid photodetector may be prepared by solution processing, and is compatible with large-scale manufacturing techniques.
110 citations
TL;DR: The defect passivation by EC significantly improves the environmental stability of the perovskite films, yielding devices that retain 80% of their initial efficiency after 30 days in ambient air at 45% relative humidity, whereas the pristine devices without EC fully degrade.
Abstract: The fast evolution of metal halide perovskite solar cells has opened a new chapter in the field of renewable energy. High-quality perovskite films as the active layers are essential for both high efficiency and long-term stability. Here, the perovskite films with enlarged crystal grain size and decreased defect density are fabricated by introducing the extremely low-cost and green polymer, ethyl cellulose (EC), into the perovskite layer. The addition of EC triggers hydrogen bonding interactions between EC and the perovskite, passivating the charge defect traps at the grain boundaries. The long chain of EC further acts as a scaffold for the perovskite structure, eliminating the annealing-induced lattice strain during the film fabrication process. The resulting devices with the EC additive exhibit a remarkably enhanced average power conversion efficiency from 17.11 to 19.27% and an improvement of all device parameters. The hysteresis index is found to decrease by three times from 0.081 to 0.027, which is attributed to suppressed ion migration and surface charge trapping. In addition, the defect passivation by EC significantly improves the environmental stability of the perovskite films, yielding devices that retain 80% of their initial efficiency after 30 days in ambient air at 45% relative humidity, whereas the pristine devices without EC fully degrade. This work provides a low-cost and green avenue for passivating defects that improves both the efficiency and operational stability of perovskite solar cells.
61 citations
Patent•
20 Oct 2017
TL;DR: In this paper, a perovskite solar battery is presented, which is formed by transparent conductive glass, an electron transfer layer, an mesoporous layer, a pervskite layer, hole transfer layer and a back electrode which are laminated in sequence.
Abstract: The invention discloses an efficient and stable perovskite solar battery, which is formed by transparent conductive glass, an electron transfer layer, a mesoporous layer, a perovskite layer, a hole transfer layer and a back electrode which are laminated in sequence. During preparation of the perovskite layer, a certain quantity of terephthalic acid (TPA) additives are added to a precursor liquid of a traditional organic and inorganic metal halide perovskite, so that growth kinetics of a perovskite crystal changes, an obtained perovskite crystal boundary is filled up, and thus joined large-sized perovskite crystal particles are formed. According to the perovskite solar battery prepared by the method, compared with an additive-free perovskite solar battery, annihilation of photoproduction excitons at the crystal boundary is reduced, so that the photoelectric conversion efficiency is obviously increased. In addition, the perovskite crystal boundary is reduced, moisture, oxygen and the like are difficult to enter from the crystal boundary to corrode the perovskite layer, thereby enabling the stability of the whole battery to be obviously better.
4 citations
Patent•
25 Aug 2017
TL;DR: In this paper, a perovskite solar cell light absorption layer and light absorption film is obtained by the spinning coating of organic lead halide perovsite precursor solution with organic carboxylic acid on a proper substrate and the heating processing.
Abstract: The invention discloses a perovskite solar cell light absorption layer, and the light absorption layer is a film which is obtained by the spinning coating of organic lead halide perovskite precursor solution with organic carboxylic acid on a proper substrate and the heating processing. The organic carboxylic acid is used for controlling the nucleating of organic lead halide perovskite and the growth of crystal, thereby improving the interface contact characteristics of a perovskite light absorption layer and an electron transmission layer. Through the coordination and electrostatic interaction between carboxyl and lead ions, the nucleating of the organic lead halide perovskite light absorption layer and the growth of crystal are controlled effectively, and the organic lead halide perovskite light absorption layer which is large in area, is smooth, is high in quality of crystalline state, is excellent in electrical performance and is stable is prepared, and good ohmic contact between the perovskite light absorption layer and the electron transmission layer is formed. The solar cell prepared in the invention can improve the efficiency and reduce the cost. The preparation technology is simple, and the repeatability is good. The batch production of the solar cell can be achieved.
3 citations