TY - JOUR
T1 - Versatility of Carbon Enables All Carbon Based Perovskite Solar Cells to Achieve High Efficiency and High Stability
AU - Meng, Xiangyue
AU - Zhou, Junshuai
AU - Hou, Jie
AU - Tao, Xia
AU - CHEUNG, Sin Hang
AU - SO, Shu Kong
AU - Yang, Shihe
N1 - Funding Information:
This work was supported by the Natural Science Foundation of China (21503011), the Fundamental Research Funds for the Central Universities (buctrc201516), the HK-RGC General Research Funds (GRF Nos. 16312216 and 16300915), the HK Innovation and Technology Fund (ITS/219/16 and GHP/079/17SZ), and the Research Grant Council of Hong Kong (HKBU 211913).
PY - 2018/5/24
Y1 - 2018/5/24
N2 - Carbon-based perovskite solar cells (PVSCs) without hole transport materials are promising for their high stability and low cost, but the electron transporting layer (ETL) of TiO2 is notorious for inflicting hysteresis and instability. In view of its electron accepting ability, C60 is used to replace TiO2 for the ETL, forming a so-called all carbon based PVSC. With a device structure of fluorine-doped tin oxide (FTO)/C60/methylammonium lead iodide (MAPbI3)/carbon, a power conversion efficiency (PCE) is attained up to 15.38% without hysteresis, much higher than that of the TiO2 ones (12.06% with obvious hysteresis). The C60 ETL is found to effectively improve electron extraction, suppress charge recombination, and reduce the sub-bandgap states at the interface with MAPbI3. Moreover, the all carbon based PVSCs are shown to resist moisture and ion migration, leading to a much higher operational stability under ambient, humid, and light-soaking conditions. To make it an even more genuine all carbon based PVSC, it is further attempted to use graphene as the transparent conductive electrode, reaping a PCE of 13.93%. The high performance of all carbon based PVSCs stems from the bonding flexibility and electronic versatility of carbon, promising commercial developments on account of their favorable balance of cost, efficiency, and stability.
AB - Carbon-based perovskite solar cells (PVSCs) without hole transport materials are promising for their high stability and low cost, but the electron transporting layer (ETL) of TiO2 is notorious for inflicting hysteresis and instability. In view of its electron accepting ability, C60 is used to replace TiO2 for the ETL, forming a so-called all carbon based PVSC. With a device structure of fluorine-doped tin oxide (FTO)/C60/methylammonium lead iodide (MAPbI3)/carbon, a power conversion efficiency (PCE) is attained up to 15.38% without hysteresis, much higher than that of the TiO2 ones (12.06% with obvious hysteresis). The C60 ETL is found to effectively improve electron extraction, suppress charge recombination, and reduce the sub-bandgap states at the interface with MAPbI3. Moreover, the all carbon based PVSCs are shown to resist moisture and ion migration, leading to a much higher operational stability under ambient, humid, and light-soaking conditions. To make it an even more genuine all carbon based PVSC, it is further attempted to use graphene as the transparent conductive electrode, reaping a PCE of 13.93%. The high performance of all carbon based PVSCs stems from the bonding flexibility and electronic versatility of carbon, promising commercial developments on account of their favorable balance of cost, efficiency, and stability.
KW - carbon
KW - fullerenes
KW - high stability
KW - perovskite solar cells
UR - http://www.scopus.com/inward/record.url?scp=85044772949&partnerID=8YFLogxK
U2 - 10.1002/adma.201706975
DO - 10.1002/adma.201706975
M3 - Journal article
C2 - 29611234
AN - SCOPUS:85044772949
SN - 0935-9648
VL - 30
JO - Advanced Materials
JF - Advanced Materials
IS - 21
M1 - 1706975
ER -
