Photoelectric Conversion Performance of Composite Perovskite Solar Cell Device and Its Application in Photovoltaic Building

A new generation of photosensitive materials, namely perovskite inorganic or organic hybrid halides, is regarded as photoelectric conversion materials. Many researchers focus on the related research. Improving the photovoltaic performance of perovskite materials and optoelectronic devices based on this material has become an important research topic. Firstly, polyoxometalate (PW12) and perovskite (CH3NH3PbI3) were combined to form polyoxometalate modified perovskite precursor solution by solution chemistry. Photoconductivity test showed that the photocurrent intensity of the composite perovskite material was three times higher than that of the pure perovskite material. Monochromatic light detection results showed that the addition of polyoxometalates increased the sensitivity of the perovskite material at 365 nm, from 0.637 A/W to 1.168 A/W, and at 420 nm, from 0.238 A/W to 0.625 A/W. Based on the above test results, the analysis of the separation and recombination process of photogenerated carriers in the polyoxometalate modified perovskite composites showed that the introduction of polyoxometalate promoted the separation of carriers and accelerated their migration, thereby weakening the recombination ability of photogenerated electrons and holes. HOOC(CH2)4NH3I was combined with CH3NH3PbI3, and polyacid was introduced to prepare perovskite solar cells. The photovoltaic cells with the composite perovskite materials were used in photovoltaic buildings. The cells’ photoelectric conversion efficiency (PCE) changed from 9.26% to 11.37%, and the efficiency was increased by 23%. Compared with the open circuit voltage of perovskite solar cells before and after adding polyoxometalates, polyoxometalates doping significantly increased the short circuit current of building solar cells (from 17.88 mA/cm2 to 22.28 mA/cm2).