Session Index

Photovoltaic Technology

Hybrid Solar Cells
Friday, Dec. 8, 2017  08:30-10:15
Presider: Tzung-Fang Guo
Room: International Research Building IR6002-C(6F)
Notes:
08:30 - 08:45 Paper No.  2017-FRI-S0903-O001
Jing-Rong Cheng Solution-Processed Perovskite Solar Cells on Flexible Substrates
Jing-Rong Cheng;Chia-Shuo Li;Te-An Yu;Chih-I Wu

With the aim of flexible photovoltaic devices, we synthesize low temperature processed (LTP) TiO2 nanoparticles as electron transport layer (ETL) . The optimized power conversion efficiency (PCE) on ITO/glass substrate is 13.42% which is slightly less than high temperature process (HTP). PCE of devices on the ITO/PEN substrate is 10.44%.

 
 
08:45 - 09:00 Paper No.  2017-FRI-S0903-O002
Sheng-De Wong Effects of iodobenzene volume on the optoelectronic properties of MAPbI3 perovskite thin films and their application in solar cells
Sheng-De Wong;Wei-Chen Huang;Sheng-Hui Chen;Sheng Hsiung Chang

he optoelectronic properties of MAPbI3 thin films were manipulated by using different iodobenzene volumes, which dominates the performance of MAPbI3 solar cells. The grain size of MAPbI3 films influences the collection of carriers and the contact at the PCBM/MAPbI3 interface, thereby resulting in a trade-off between the FF and JSC.

 
 
09:00 - 09:15 Paper No.  2017-FRI-S0903-O003
Chih Lin Chiu Surface Textured Hybrid PEDOT:PSS-Silicon Solar Cells Employing Kirigami Graphene
Pei Chen Yu;Chih Lin Chiu

we demonstrate the conformal coverage of patterned kirigami graphene layers on surface textured hybrid PEDOT:PSS-silicon solar cells to enhance collection of charge carriers. As a result, the photovoltaic characteristics of hybrid solar cells are largely improved, showing enhancement of fill factor and power conversion efficiency by 3.3% and 9.8%

 
 
09:15 - 09:30 Paper No.  2017-FRI-S0903-O004
Muhammad Khairuddin Investigating the Performance of Dye Sensitized Solar Cell for Indoor Photovoltaic System under Fluorescent Lamps with Diverse Color Temperatures
Muhammad Khairuddin;Hsiao-Yi Lee

This paper proposes the best CCT to be utilized for indoor PV system. The performance of DSSC under fluorescent lamps T5/865 with CCT 6500K and T5/830 with CCT 3000K will be investigated. The results show that T5/830 is slightly better for DSSC’s outcome in indoor use.

 
 
09:30 - 10:00 Paper No.  2017-FRI-S0903-I001
Invited Speaker:
Tae-Woo Lee
Polymeric interfacial layers in organic and perovskite photovoltaics
Tae-Woo Lee

Tailoring the interfacial energetics between an electrode and a photoactive layer in organic photovoltaics (OPVs) and metal-halide hybrid perovskite photovoltaics (PePVs) is important to maximize open circuit voltage (Voc) and thereby power conversion efficiency (PCE). Here, we introduced hole- or electron- extracting polymeric interfacial layers to minimize the interfacial energy offset between the electrode and the photoactive layer leading to improved PV characteristics. Although PEDOT:PSS is the most widely used hole extraction layer (HEL), it cannot make Ohmic contact with overlying organic or perovskite photoactive layer due to its low work function (~5.0 eV) leading to decrease in Voc and thereby PCE (PCDTBT and MAPbI3 ~5.4 eV). To overcome the problem, we used self-organized hole extraction layer (SOHEL) which has an increasing gradient WF from bottom to top owing to the gradient concentration of perfluorinated ionomer (PFI) in the film. Use of SOHEL successfully increased Voc and thereby PCE of both organic and perovskite PVs by minimizing energy offset with the photoactive layers. PEDOT:PSS has another problem in terms of aggregation which can degrade PV performance. Therefore, we used a self-doped conducting polymer, PSS-g-PANI, which is soluble in polar solvents. Since PSS-g-PANI also has low work function, nevertheless, PFI was added into PSS-g-PANI to solve the problem of energy mismatch with the photoactive layer. Lastly, improvement in energy level alignment between electron extraction layers (EELs) and a photoactive layer was achieved using solution-processed ultrathin insulating polymer or conjugated polyelectrolytes (CPEs). The insulating polymer, poly(4-hydroxystyrene) (PHS), was found to form a dipole layer that upshifts the vacuum level of the adjacent negative electrode. CPEs (PSBFB-Na, PAHFP-Br) also decreased energy barrier between Al electrode and a photoactive layer. In addition, the ionic groups in the CPEs further improved energy level alignment at the interface after electric-polling which led to redistribution of them. Therefore, the use of PHS or CPE interlayer significantly improved the built-in potential, Voc and PCE of devices.

 
 
10:00 - 10:15 Paper No.  2017-FRI-S0903-O005
Wei-Cheng Hsieh Efficiency Variation of Single Halide Lead Perovskite Solar cells by Sandwich Deposition Technique
Chun-Hsiao Kuan;Po-Tsun Kuo;Wei-Cheng Hsieh;Ching-Fuh Lin

In this research, we discover the perovskite solar cell has the best efficiency 7-10 days after it is fabricated. After being kept in vacuum condition, the solar cell performed the best after several days. The CH3NH3PbI3 perovskite solar cell has Jsc=23.79mA/cm2, Voc=0.9V, FF= 76.2 and PCE= 16.43% respectively.