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- W3010791418 abstract "Rapid technological development has led to perovskite solar cells (PSCs) with certified efficiencies exceeding 24%, surpassing traditional thin-film solar technologies on small-scale devices (< 1 cm2). Arguably, the key factor driving this change is the outstanding optical and electronic properties of perovskites. As a group of low cost and highly efficient light-absorbing materials, the solution processability of perovskites allows relatively simple and potentially scalable solar-cell (SC) fabrication. The current generation of state-of-the-art PSCs requires selective charge-transport layers (CTLs) adjacent to the perovskite absorber to efficiently extract photogenerated electrons and holes through their respective electrodes. However, the current CTLs limit the efficiency of PSCs below the thermodynamic potential due to their imperfect charge selectivity and their comparatively low mobility, which cause additional non-radiative interface recombination and high series resistance that lead to voltage and fill factor (FF) losses. Especially in the planar p-i-n structure, the perovskite absorber is sandwiched between two organic CTLs, with relatively low inherent mobility increasing the difficulty for improvement. Several reports have indicated development of device efficiency can be facilitated by effective surface passivation on the perovskite/CTL interface, causing non-radiative recombination losses to dramatically reduce. Motivated by these works, detailed studies on perovskite interfaces and energy losses in planar p-i-n high-efficiency two-dimensional (2D) and three-dimensional (3D) perovskites are presented in three chapters of this thesis. First, a novel hole-transport layer (HTL) is introduced to replace poly(3,4-ethylenedioxythiphene):poly(styrenesulphonate) (PEDOT:PSS) to obtain highly efficient SCs. An effective approach was investigated to successfully modify the surface of HTLs for facilitating perovskite deposition and completing device fabrication. Second, specific strategies are applied to analyse the energy losses in perovskites, the perovskite/CTL interface and perovskite devices. Based on these analyses, the perovskite/CTL was further passivated to achieve certified 1 cm2, highly efficient 3D PSCs. Finally, a quantitative optoelectrical study is presented to reveal the energy- and charge-transport loss mechanisms in 2D perovskites for future improvement of PSCs. Overall, the work presented in this thesis not only introduces strategies to produce highly efficient PSCs, but also elaborates an in-depth understanding of perovskite photovoltaic (PV) device physics." @default.
- W3010791418 created "2020-03-23" @default.
- W3010791418 creator A5058481549 @default.
- W3010791418 date "2020-03-05" @default.
- W3010791418 modified "2023-09-27" @default.
- W3010791418 title "Planar-inverted Perovskite Solar Cells: Working Principles, Materials and Interfaces" @default.
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- W3010791418 doi "https://doi.org/10.14264/uql.2020.199" @default.
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