研究目的
To overcome the limitations of CQD/organic hybrid photovoltaics, specifically their power conversion efficiencies below 10%, by introducing small molecules into the CQD/organic stacked structure to enhance energy transfer and exciton dissociation.
研究成果
The hybrid CQD/polymer platform, enhanced by the introduction of small molecules, achieves a maximum PCE of 13.1% and demonstrates excellent stability, retaining over 80% of initial performance after 150 hours of continuous operation. This advancement highlights the potential of hybrid technology for efficient and stable solution-processed photovoltaics.
研究不足
The study acknowledges the challenges in achieving high PCEs in CQD/organic hybrid photovoltaics due to chemical mismatch and difficulties in charge collection. The introduction of small molecules addresses some of these issues but may introduce new complexities in device fabrication and stability.
1：Experimental Design and Method Selection:
The study revisited the CQD/polymer architecture by modifying the polymer layer with a low-bandgap non-fullerene small molecule to increase the efficiency of exciton dissociation and funneling. Techniques such as ultrafast transient absorption (TA) and photoluminescence excitation (PLE) spectroscopies, as well as external and internal quantum efficiency (IQE) measurements, were employed.
2：Sample Selection and Data Sources:
Oleic acid-capped lead sulfide (PbS) CQDs were prepared, and various p-type polymers were screened for their combinations with CQDs in both bulk-heterojunction (BHJ) and bilayer configurations.
3：List of Experimental Equipment and Materials:
The study used ZnO sol-gel solution, PbS CQDs, various polymers, and small molecules like IEICO. Equipment included a Keithley 2400 sourcemeter for J-V characterization, UV–visible–infrared spectrophotometer for absorbance measurements, and TEM for structural analysis.
4：Experimental Procedures and Operational Workflow:
Devices were fabricated by spin-coating layers of ZnO, CQDs, and polymer-small molecule blends, followed by thermal evaporation of electrodes.
5：Data Analysis Methods:
The study analyzed data using global fitting of TA data with decay associated spectra (DAS), PLE spectroscopy, and IQE measurements to understand charge and energy transfer dynamics.
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