Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 8, Issue 20, Pages 12822-12829Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b02478
Keywords
perovskite solar cells; planar structures; small molecules; polymer binders; charge extractions; interfacial layers
Funding
- National Research Foundation of Korea (NRF) - Korea government (MSIP) [2012M2A2A6013183]
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The highly efficient CH3NH3PbI3 perovskite solar cell (PeSC) is simply achieved by employing a blended electron-transport layer (ETL) consisting of PC61BM and P(NDI2OD-T2). The high molecular weight of P(NDI2OD-T2) allows for a thinned ETL with a uniform morphology that optimizes the PC61BM ETL more effectively. As a result of this enhancement, the power conversion efficiency of a PC61BM:P(NDI20D-T2)-based PeSC is 25% greater than that of the conventional PC61BM based-PeSC; additionally, the incorporation of P(NDI2OD-T2) into PC61BM attenuates the dependence of the PeSC on the ETL-processing conditions regarding its performance. It is revealed that, in addition to the desirable n-type semiconducting characteristics of PC61BM:P(NDI2OD-T2) including a higher electron-mobility and a more-effective electron selectivity of a blended ETL for an efficient electron extraction the superior performance of a PC61BM:P(NDI2OD-T2) device is the result of a thinned and uniformly covered ETL on the perovskite layer.
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