DEVELOPMENT OF MID-BANDGAP AND WIDE-BANDGAP PEROVSKITE SOLAR CELLS BY SEQUENTIAL METHOD IN PIN CONFIGURATION

Date

2024-8-19

Author

ZAREAN AFSHORD, AMIR

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Perovskite solar cells (PSCs) have achieved power conversion efficiencies (PCE) exceeding 26%, yet they continue to suffer from stability issues. In this study, we focused on the development of efficient and stable PSCs using a hybrid vapor-solution method, aimed at achieving stable mid and wide bandgap PSCs for tandem and large-area applications. The hybrid method was chosen for its ability to control thickness and composition uniformly. Initially, a systematic optimization of the perovskite absorber layer was conducted, improving the PCE from 7% to over 17%. This was achieved by refining the CsI evaporation rate during the co-evaporation of PbI2 and CsI, optimizing PbI2 thickness, and adjusting MABr, MACl, and FAI concentrations. Further enhancements, including interface and transport layer modifications and bulk passivation with CsI and RbI, pushed the PCE beyond 22%. The research then advanced to develop wide bandgap PSCs by introducing CsBr and MABr, resulting in two champion recipes: one with a 21% PCE and 1.64 eV bandgap, and another with a 20.35% PCE and 1.67 eV bandgap. Semi-transparent cells fabricated with these recipes achieved an 18.5% PCE, while mini-modules with a 16 cm² area reached 19.87% PCE. The semi-transparent cells were also used in four-terminal perovskite/bifacial silicon tandem cells, yielding a 30.61 mW/cm² power output. Stability tests revealed that the 1.67 eV cell, with higher CsBr content and no MABr, exhibited superior stability, highlighting Cs's role in enhancing PSC stability and the destabilizing effect of MA.

Subject Keywords

Perovskite solar cells, Sequential hybrid method, Mid-bandgap, Wide-bandgap, Stable wide-bandgap

URI

https://hdl.handle.net/11511/111282

Collections

Graduate School of Natural and Applied Sciences, Thesis