Improvement of inverted planar heterojunction solar cells efficiency by using KI/Alq3 hybrid exciton blocking layer
Résumé
The exciton blocking layer (EBL) as an interfacial layer is extremely critical in determining the organic photo-voltaic cell (OPV) performances. Here, we studied inverted planar heterojunction solar cells PHJ-OPVs with the following configuration ITO/EBL/C60/CuPc/MoO3/Al. Upon the EBL functionality which can act as an exciton blocking layer and allows the electron collection at the cathode, we proposed the insertion of hybrid EBL con -sisted of KI/Alq(3) thin layer. The Alq(3) is known as an EBL due to its broad bandgap, whereas we found that when a thin layer of 1 nm of KI is introduced in ITO/Alq(3) interface, the KI decomposed during the thermal deposition, and only potassium interacts and diffuses in the Alq(3) layer, which effectively enhances the electrons collection at the ITO/C-60 interfaces leading to the improvement of open-circuit voltage (Voc), and device power conversion efficiency by 36% than the device using Alq(3) alone as EBL.
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