Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 30, Pages 25329-25336Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b05949
Keywords
perovskite solar cells; PEOz; PEDOT:PSS; V-oc; hysteresis
Funding
- National Natural Science Foundation of China [61575019]
- NSF-PECASE award [CBET-0954985]
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The successful commercialization of perovskite solar cells (Pvs-SCs) calls for the need to find low-temperature processable interlayers with outstanding charge-transport features. In this work, we strategically blend poly(2-ethyl-2-oxazoline) (PEOz) with PEDOT:PSS as the modified hole transport layer (HTL) to achieve high-efficiency P-I-N CH3NH3PbI3 Pvs-SCs. The PEOzPEDOT:PSS HTL exhibits enhanced features over the conventional layer including the following: (1) promoting perovskite with enlarged grain sizes to decrease the perovskite layer's recombination, (2) increasing the work function of the HTL, and (3) decreasing the noncapacitive current in Pvs-SCs. Remarkably, we demonstrate a 17.39% power conversion efficiency with very low hysteresis and high V-oc values of 1.075 V for Pvs-SCs with PEOz-PEDOT:PSS.
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