Correlating carrier lifetime with device design and photovoltaic performance of perovskite solar cells

In recent years, lead halide perovskites have attracted considerable attention from the scientific community due to their exceptional properties and fast-growing enhancement for solar energy harvesting efficiency. One of the fundamental aspects of the architecture of perovskite-based solar cells (PSCs) is the electron transport layer (ETL), which also acts as a barrier for holes. In this work, the influence of compact TiO2 ETL on the performance of planar heterojunction solar cells based on CH3NH3PbI3 perovskite was investigated. ETLs were deposited on fluorine-doped tin oxide (FTO) substrates from a titanium diisopropoxide bis(acetylacetonate) precursor solution using the spin-coating method with changing precursor concentration and centrifugation speed. It was found that the thickness and continuity of ETLs, investigated between 0 and 124 nm, strongly affect the photovoltaic performance of PSCs, in particular short-circuit current density (JSC). Optical and topographic properties of the compact TiO2 layers were investigated as well.

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Abnormal spatial heterogeneity governing charge-carrier mechanism in efficient Ruddlesden-Popper perovskite solar cells

Energy & Environmental Science ◽

10.1039/d1ee00984b ◽

2021 ◽

Author(s):

Jun Xi ◽

Junseop Byeon ◽

Unsoo Kim ◽

Kijoon Bang ◽

Gi Rim Han ◽

...

Keyword(s):

Solar Cells ◽

Charge Carrier ◽

Spatial Heterogeneity ◽

Real Time ◽

Photovoltaic Performance ◽

Perovskite Solar Cells ◽

Carrier Mechanism

Layered Ruddlesden–Popper perovskite (RPP) photovoltaics have gained substantial attention owing to their excellent air stability. However, their photovoltaic performance is still limited by the unclear real-time charge-carrier mechanism of operating...

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Effects of CsSnxPb1−xI3 Quantum Dots as Interfacial Layer on Photovoltaic Performance of Carbon-Based Perovskite Solar Cells

Nanoscale Research Letters ◽

10.1186/s11671-021-03533-y ◽

2021 ◽

Vol 16 (1) ◽

Author(s):

Chi Zhang ◽

Zhiyuan He ◽

Xuanhui Luo ◽

Rangwei Meng ◽

Mengwei Chen ◽

...

Keyword(s):

Quantum Dots ◽

Solar Cells ◽

Photovoltaic Performance ◽

Perovskite Solar Cells ◽

Photogenerated Electron ◽

Depletion Region ◽

Band Alignment ◽

Back Surface ◽

The One ◽

Carbon Based

AbstractIn this work, inorganic tin-doped perovskite quantum dots (PQDs) are incorporated into carbon-based perovskite solar cells (PSCs) to improve their photovoltaic performance. On the one hand, by controlling the content of Sn2+ doping, the energy level of the tin-doped PQDs can be adjusted, to realize optimized band alignment and enhanced separation of photogenerated electron–hole pairs. On the other hand, the incorporation of tin-doped PQDs provided with a relatively high acceptor concentration due to the self-p-type doping effect is able to reduce the width of the depletion region near the back surface of the perovskite, thereby enhancing the hole extraction. Particularly, after the addition of CsSn0.2Pb0.8I3 quantum dots (QDs), improvement of the power conversion efficiency (PCE) from 12.80 to 14.22% can be obtained, in comparison with the pristine device. Moreover, the experimental results are analyzed through the simulation of the one-dimensional perovskite/tin-doped PQDs heterojunction.

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