研究目的
To further increase the PCEs of binary organic solar cells (OSCs) incorporating small molecular acceptor (SMA) Y6 by substituting PM6 with PM7 due to the deeper highest occupied molecular orbital (HOMO) of PM7.
研究成果
The PM7:Y6 system achieves a champion PCE as high as 17.0%, with a VOC of 0.897 V, a JSC of 25.644 mA cm?2, and an FF of 74.0%. This PCE is the highest among single-junction binary PSCs, providing more understanding of advancing PCE by increasing VOC through enlarging the gap between ELUMO-donor and EHOMO-acceptor.
研究不足
The study focuses on the binary system of PM7:Y6 and the hot-cast method for device fabrication. Other methods or materials were not explored, which might offer further improvements in PCE.
1：Experimental Design and Method Selection:
The study substituted PM6 with PM7 to match with Y6, aiming to achieve higher VOC due to PM7's lower EHOMO. The hot-cast device fabrication method was used to optimize the morphology of the active layer.
2：Sample Selection and Data Sources:
Devices were fabricated based on PM6:Y6 and PM7:Y6 systems. The photovoltaic parameters were measured and compared.
3：List of Experimental Equipment and Materials:
The device structure was ITO/PEDOT:PSS/D:A/PNDIT-F3N/Ag. UV-vis absorption spectra, energy level distribution, and photovoltaic parameters were measured.
4：Experimental Procedures and Operational Workflow:
A series of devices were fabricated, and their corresponding photovoltaic parameters were listed. The current density-voltage (J-V) plots and external quantum efficiency (EQE) measurement were conducted.
5：Data Analysis Methods:
The charge-carrier mobilities were measured by space charge limited current (SCLC) method. The saturation current (Jsat), exciton dissociation efficiency (ηdiss), and charge collection efficiency (ηcoll) were calculated.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
