- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Doping induced performance enhancement in inverted small molecule organic photodiodes operating below 1V reverse bias - Towards compatibility with CMOS for imaging applications
摘要： Organic photodiodes (OPDs) offer a myriad of advantages over conventional inorganic photodetectors, making them particularly attractive for imaging application. One of the key challenges preventing their utilization is the need for their integration into the standard CMOS processing. Herein, we report a CMOS-compatible top-illuminated inverted small molecule bi-layer OPD with extremely low dark leakage current. The device utilizes a titanium nitride (TiN) bottom electrode modified by a [6,6]-phenyl C61 butyric acid methyl ester (PCBM) cathode buffer layer (CBL). We systemetically show that doping the CBL enhances device's low voltage (below 1 V reverse bias) photoresponse by increasing the linear dynamic range (LDR) and making the bandwidth of the photodidoe broader without compromising the leakage current. The optimized device exhibits a dark leakage current of only ~ 6 x 10-10 A/cm2 at -0.5 V. The external quantum efficiency (EQE) at 500 nm reaches 23% with a calculated specific detectivity as high as 7.15 x 1012 cm Hz1/2/W (Jones). Also the LDR approaches 140dB and the bandwidth is about 400kHz, at -0.5 V bias. The proposed device structure is fully compatible with CMOS processing and can be integrated onto a CMOS readout circuit offering the potential to be applied in high-performance large-scale imaging arrays.
关键词： Interface engineering,Doping,CMOS,Titanium nitride,Organic photodiode,Cathode buffer layer
更新于2025-09-23 15:23:52
-
Novel cathode buffer layer of Al(acac)3 enables efficient, large area and stable semi-transparent organic solar cells
摘要： Electrode buffer layer plays a more crucial in semi-transparent organic solar cells (ST-OSCs) than that of the opaque devices due to the additional requirements of the average visible transmittance (AVT) and color rendering index (CRI) besides the power conversion efficiency (PCE). Herein, we developed a novel cathode buffer layer Aluminum(III) acetylacetonate (Al(acac)3) via mild spin-coating with post low temperature heat treatment process. Studies show that Al(acac)3 film possess outstanding optical features and suitable energy level. Namely, the absorption of Al(acac)3 film with thickness of 10 nm is as low as 1% and the transmittance is high up to 95% in the visible and near infrared regions, guarantying full absorption of the photoactive layer and high CRI for ST-OSCs; and the suitable energy level ensures a smooth electron transport and collection process. By introducing Al(acac)3 film in ST-OSCs, the devices based on PM6:Y6 yield an efficiency of 12.41%, an AVT of 25.33% (from 370 nm to 740 nm) and a CRI of 94.6. Encouragingly, the large-area ST-OSC of 100 mm2 with Al(acac)3 buffer layer yields an efficiency of 11.28%. Further long-term stability of ST-OSCs show that the device with encapsulation retains its 60% of the initial PCE over 60 hours continuous illumination. The results indicate that Al(acac)3 is a promising cathode buffer layer for fabricating efficient, large area and stable semi-transparent organic solar cells.
关键词： Semitransparent organic solar cells,cathode buffer layer,stability,Aluminum(III) acetylacetonate,large-area device
更新于2025-09-23 15:21:01
-
Double fullerene cathode buffer layers afford highly efficient and stable inverted planar perovskite solar cells
摘要： Fullerene derivatives especially [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) with strong electron-accepting abilities have been commonly implemented as indispensable cathode buffer layers (CBLs) of inverted (p-i-n) planar perovskite solar cells (iPSCs) to facilitate electron transport. However, only a single fullerene CBL is typically used in iPSC devices, resulting in interfacial energy offset between fullerene CBL and metal cathode and consequently insufficient electron transport. Herein, we synthesized a novel bis-dimethylamino-functionalized fullerene derivative (abbreviated as PCBDMAM) and applied it as an auxiliary fullerene interlayer atop of PCBM to form a PCBM/PCBDMAM double fullerene CBL, leading to dramatic enhancement of both efficiency and ambient stability of iPSC devices. Incorporation of PCBDMAM interlayer facilitates the formation of interfacial dipole layer between PCBM and Ag cathode, resulting in decrease of the work function of the Ag cathode. As a result, the CH3NH3PbI3 (MAPbI3) iPSC devices based on PCBM/PCBDMAM double fullerene CBL exhibit the highest power conversion efficiency (PCE) of 18.11%, which is drastically higher than that of the control device based on single PCBM CBL (14.21%) and represents the highest value reported for double fullerene CBL-based iPSC devices. Moreover, due to the higher hydrophobicity of PCBDMAM than PCBM, iPSC devices based on PCBM/PCBDMAM double fullerene CBL shows an enhanced ambient stability, retaining 67% of the initial PCE after storage 1440 h exposure under the ambient atmosphere without any encapsulation, whereas only 43% retaining was achieved for the control device based on single PCBM CBL.
关键词： Cathode buffer layer,Perovskite solar cells,Work function,Interfacial engineering,Fullerene derivative
更新于2025-09-23 15:21:01