Development of perovskite solar cells based on quantum dots
Résumé
Emerging photovoltaic (PV) technologies are being developed to improve the performance and the stability of solar cells. The objective of this work is the assembly of two types of light harvester materials (perovskite and quantum dots (QDs)) forming a heterojunction to obtain devices with good PV activity and stability enhancement at ultraviolet (UV) region.1,2 First, solar cells based on perovskite as active layer were fabricated and characterized, taking into account the challenge to work in ambient atmosphere (no glove box) to be close to an industrial process. Two types of PV devices (drop casted and spin coated, Figure 1a-b) were prepared using a simple MAPbI3 with 5-Ammonium valeric acid iodide (AVAI) additive and a mixed halide perovskite MAPbI3−xClx. The resulting maximum power conversion efficiencies (PCE) of the devices were 10.7 % and 12.9 % for drop casted and spin coated cells, respectively. Afterwards, the research continued with the synthesis and characterization of CsPbBr3 quantum dots and their incorporation into PV devices in combination with perovskite (Figure 1c). The performance obtained by coupling QDs with perovskite was better than perovskite alone only for drop casted devices with an absolute PCE increase of 5.6 %. To further investigate the stability of these devices, aging campaigns at damp heat conditions and light exposure will be conducted. Dedicated characterizations techniques will be used for the study and analysis of layer modifications due to degradation.