Abstract
Further boosting the power conversion efficiencies (PCEs) of perovskite solar cells (PSCs) without excessively increasing production expenses is critical for practical applications. Here, we introduce silicon quantum dots (SiQDs) to enable perovskites to harvest additional sunlight without changing PSC processes. These SiQDs can convert shorter wavelength excitation light (300–530 nm) into visible region light and reflect longer wavelength perovskite-unabsorbed visible light (550–800 nm), leading to broadband light absorption enhancement in PSCs. As a result, the SiQD-based photocurrent gain can improve the external quantum efficiencies of PSCs over a wide wavelength range of 360–760 nm, yielding relatively enhanced short-circuit current density (+1.66 mA/cm2) and PCE (+1.4%). Surprisingly, even the PSC with a low-purity perovskite layer shows an ultrahigh PCE improvement of 5.6%. Our findings demonstrate QD-assisted effects based on earth-abundant and environmentally friendly silicon, leading to effective optical management that remarkably promotes the performance of PSCs and enables the balance of costs to be substantially addressed.
Highlights
The past decade has witnessed amazing advances in organic–inorganic perovskite solar cells (PSCs), with the power conversion efficiency (PCE) drastically increasing from 3.8% to more than 25%1–10
The long wavelength luminescence can be attributed to quantum confinement effects[34,35,36], while the short wavelength luminescence is caused by oxidized SiQDs27,37
To further explore the reasons for the reduction in the photoelectric responses after adding excess silicon quantum dots (SiQDs), we systematically studied the morphology evolution of SiQDs deposited onto MAPbI3 perovskites with increasing concentration
Summary
The past decade has witnessed amazing advances in organic–inorganic perovskite solar cells (PSCs), with the power conversion efficiency (PCE) drastically increasing from 3.8% to more than 25%1–10. The extraordinary PCEs have already exceeded those of multicrystalline Si solar cells and are not far from the single crystal values[10]. Crystalline Si modules still dominate the current photovoltaic industry because their mature technology has led to a continuous decrease in costs[11]. The major costs for solar panel manufacturing are area-related balance-of-system costs; increasing the PCE is a key the development of a simple method through which sunlight can be maximally absorbed to boost the performance of PSCs without changing the crystallization. After hydrosilylation reactions, the PL quantum efficiencies of colloidal SiQDs with visible luminescence are increased
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