Publications by authors named "Himanshu Phirke"
Chemically processed methylammonium tin-triiodide (CHNHSnI) films include Sn in different oxidation states, leading to poor stability and low power conversion efficiency of the resulting solar cells (PSCs). The development of absorbers with Sn [2+] only has been identified as one of the critical steps to develop all Sn-based devices. Here, we report on coevaporation of CHNHI and SnI to obtain absorbers with Sn being only in the preferred oxidation state [+2] as confirmed by X-ray photoelectron spectroscopy.
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- Alkali treatments, particularly with RbF, improve the efficiency of Cu(In,Ga)Se solar cells by passivating electronic defects and preventing surface oxidation.
- Using scanning tunneling and X-ray photoelectron spectroscopy, researchers found that Rb attaches to the surface and its submonolayer coverage plays a critical role in surface passivation.
- However, the study also revealed that while Rb accumulation can enhance surface properties, it may lead to increased electronic defect levels and surface dipole formation, indicating potential drawbacks for long-term performance.