- 标题
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π-Conjugated small molecules enable efficient perovskite growth and charge-extraction for high-performance photovoltaic devices
摘要： A π-conjugated small molecule N,N'-bis(naphthalen-1-yl)-N,N'-bis(phenyl)benzidine (NPB) is introduced into a poly (bis(4-phenyl)(2,4,6-trimethylphenyl)amine) (PTAA) hole transport layer in inverted perovskite solar cells (PSCs). The NPB doping induces better perovskite crystal growth owing to a strong π-π interaction with PTAA and cation-π interactions with CH3NH3+ (MA+). In addition, NPB doping not only improves the wettability of PTAA and regulates the perovskite crystallization to achieve a larger grain size, but also moves the valence band energy of the hole transport layer closer to the perovskite layer. Consequently, the fabricated PSCs delivered a power conversion efficiency (PCE) of 20.15%, with a short-circuit current density (JSC) of 22.60 mA/cm2 and open-circuit voltage (VOC) of 1.14 V. This outcome indicates that PTAA:NPB composite materials present great potential for fabricating high-performance PSCs.
关键词： Energy level alignment,Charge extraction,π-conjugated molecule
更新于2025-09-11 14:15:04
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Minimizing Voltage Loss in Efficient All-inorganic CsPbI2Br Perovskite Solar Cells through Energy Level Alignment
摘要： All-inorganic CsPbI2Br, prized for its strong stability against thermal aging and light soaking, has attracted intensive attention. However, a large energy loss results from the serious energy level offset of 1.05 eV between CsPbI2Br and Spiro-MeOTAD, hindering further efficiency improvement of PSCs. To address this issue, a moderate energy level (CsPbI2Br)1-x(CsPbI3)x layer has been introduced at the interface between CsPbI2Br and Spiro-MeOTAD to form graded energy level alignment. The interpolation of which has offered the energy level gradient for reducing the resistance of hole transport. Correspondingly, the energy level tailoring has minimized the energy loss and a remarkable VOC improved from 1.12 V to 1.32 V, which is one of the highest values for CsPbI2Br based solar cells. A relatively good thermal stability has also been validated. These good performances indicate that setting an intermediate energy level alignment will be a potential strategy for idealized device architecture to minimize energy loss.
关键词： Thermal Stability,Voltage Loss,Energy Level Alignment,All-inorganic CsPbI2Br,Perovskite Solar Cells
更新于2025-09-11 14:15:04